单项选择题

A．reason
B．for
C．since
D．because
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单项选择题
If you want to improve the taste, try ______ some sugar.
A．to add
B．to adding
C．add
D．adding
单项选择题
He ______ to your home, for he doesn't know your address.
A．can't have been
B．mustn't have been
C．shouldn't have been
D．needn't have been
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