_______ is the most useful invention? A．Do you think which of these B．Which of these do you.
_______isthemostusefulinvention?A．DoyouthinkwhichoftheseB．WhichofthesedoyouthinkC．Whi...
_______ is the most useful invention? A．Do you think which of these B．Which of these do you think C．Which of these you think D．You think which of these
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| 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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