单项选择题

______ sets man apart from the rest of the animal kingdom is his ability to speak.

A．Which
B．Whom
C．Who
D．What
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单项选择题
Dr. Bruce will first give you a summary of the situation and then discuss it ______.
A．at interval
B．at random
C．at issue
D．at length
单项选择题
Something is wrong with your truck. You'd better have it ______.
A．repairing
B．repair
C．repaired
D．to be repaired
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