单项选择题

Not that I'm unwilling to lend you a hand, ______ I'm too busy for the moment.

A．because
B．but that
C．but
D．however
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单项选择题
______ anyone call while I am away, please write down his name and address.
A．If
B．Should
C．Could
D．In case
单项选择题
--Tom often has bread for breakfast, ______ he--Yes, he ______ .
A．doesn't; has
B．didn't; did
C．hasn't; has
D．doesn't; does
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