_______ is the most useful invention?
A．Do you think which of theseB．Which of these do you think
C．Which of these you thinkD．You think which of these
B
考查插入語。do you think是插入語，去掉后不影響句意，當(dāng)that后用特殊疑問詞時，不能省略that，A項錯。故選B。
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