_______ is the most useful invention?
A.Do you think which of theseB.Which of these do you thinkC.Which of these you thinkD.You think which of these在线课程B
解析：
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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