单项选择题

We must not ______ know when we do not know.

A. pretend to
B. realize to
C. consider to
D. act to
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单项选择题
Living here at the top of the mountain with no one else near, the old man must be very ______.
A. only
B. alone
C. lone
D. lonely
单项选择题
The order that Marines ______ came from the president himself.
A. accepted
B. allowed
C. received
D. taken
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