单项选择题

He never hesitates to make such criticisms ______ are considered helpful to others.

A. that
B. what

C. which
D. as
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I have no objection ______ your story again.
A. to hear



B. to having heard
C. to hearing


D. to have heard
单项选择题
By no means ______ create or destroy energy.
A. we can
B. we can’t
C. can we
D. shall we
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