单项选择题

He had studied hard, he would have been able to pass the exam.

A．He had studied harder
B．if only he studied more
C．Had he studied harder
D．When he studied more
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You're been so helpful! How can I make up to you
A．make it up to you
B．make you up
C．make up it for you
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He didn't to return earlier than 3 o'clock.
A．was not expected
B．did not expect
C．was expected not
D．was not expecting
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