单项选择题
He regretted the days______he wasted in the woods and when he should have studied.
A．when
B．where
C．that
D．what
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单项选择题
The captain Was unwilling to_______me command of the ship．
A．hand over
B．hand in
C．hand out
D．hand on
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单项选择题
______，John would have told you about it．
A．If he has known it
B．Had he known it
C．If he knew it
D．Should he know it
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