单项选择题

There are so many mysteries waiting to be () that it seems that man is not wise enough.

A. opened
B. solved
C. unfastened
D. created

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单项选择题
51（）.

A. investigation
B. insight
C. consideration
D. prospect
单项选择题
In spite of the accusation, the suspect () to be innocent and kept protesting.

A. assumed
B. claimed
C. presumed
D. insisted
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