单项选择题

（）Mary had heard that sound was she really frightened.

A．Not when
B．Not as
C．Not until
D．Until

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单项选择题
You have worked too hard and you'd better take a holiday northward or（）

A．however
B．whatever
C．wherever
D．whichever
单项选择题
The reason why I plan to do so is（）if I don't.

A．because she will be disappointed
B．that she will be disappointed
C．because she will have been disappointed
D．for she will be disappointed
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