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科目： 來源：北京市期末題 題型：單選題

Scientists say it still needs five or six years _____ it is possible for human patients to take this medicine.
[     ]
A. since
B. before
C. after
D. when

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科目： 來源：北京市期末題 題型：單選題

—It's a long story, but there are not any new words in it.
—Good! _______ it will be hard for children.
[     ]
A. So
B. Or
C. But
D. And

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科目： 來源：江蘇省期末題 題型：單選題

I haven't heard from Bill _____ he left here. 
[     ]
A. when
B. before
C. since
D. while

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科目： 來源：江蘇省期末題 題型：單選題

Mr Smith usually reads a newspaper _____ he's waiting for the bus.
[     ]
A. if
B. then
C. because
D. while

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科目： 來源：天津模擬題 題型：單選題

Someone called me at midnight, but he hung up _____ I could answer it.
[     ]
A. as
B. since
C. after
D. before

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科目： 來源：江蘇模擬題 題型：單選題

_______ I have a lot of housework to do, I still finish my homework on time.
[     ]
A. Unless
B. If
C. Although
D. So that

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科目： 來源：0115 模擬題 題型：單選題

He met many problems ______ he was going over his lessons.
[     ]
A. before
B. as soon as
C. since
D. while

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科目： 來源：上海模擬題 題型：單選題

______ it rained heavily, they arrived at Shanghai Grand Theatre in time.
[     ]
A. But
B. Though
C. Because
D. If

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科目： 來源：上海模擬題 題型：單選題

Miss Wang asked me ________ I was busy with the test those days.
[     ]
A. that
B. if
C. when
D. what

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科目： 來源：天津市期末題 題型：單選題

Make sure _____ he is at home or not before you call on him.
[     ]
A. if
B. whether
C. what
D. how

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