题目内容

___ is the most useful invention?
A．Do you think which of theseB．Which of these you know
C．Which of these do you knowD．You know which of these
C
考察句型，do you know是插入语，与句子结构无关，放在句中。
句意为，你知道这些发明里面哪个是最有用的发明？
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