单项选择题

Doing your homework is a sure way to improve your test scores, and this is especially true ______ it comes to classroom tests.

A．before
B．as
C．since
D．when
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I apologize if I ______ you, but I assure you it was unintentional.
A．offend
B．had offended
C．should have offended
D．might have offended
单项选择题
Although a teenager, Fred could resist ______ what to do and what not to do.
A．to be told
B．having been told
C．being told
D．to have been told
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