单项选择题

I didn't (mind) their (coming) late to the lecture, but I (objected) their making (so much) noise.

A．mind
B．coming
C．objected
D．so much
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单项选择题
Bats (are able) to (guide them) by producing sound waves (too high) for us (to hear).
A．are able
B．guide them
C．too high
D．to hear
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