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_______ 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
考查插入语。do you think是插入语,去掉后不影响句意,当that后用特殊疑问词时,不能省略that,A项错。故选B。
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