Since three months ago, the number of students making notes while listening in class ________ 90％．

[　　]
A．

has increased by

B．

was increased to

C．

have increased for

D．

had increased by

答案：A
解析：

since three months ago是現(xiàn)在完成時的時間狀語，所以句子的時態(tài)要用現(xiàn)在完成時。increase by 意思是“增長了多少”，而increase to為“增長到(一個具體的數(shù)字)”。the number of students意思是“學(xué)生的數(shù)目”，謂語動詞應(yīng)該用單數(shù)形式。


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