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题型：单选题题类：真题难易度：普通

We'll have a picnic near the river tomorrow it rains heavily.

A、until B、if C、unless D、when

举一反三

_____ my cousin is very young, _____ she can help with the housework.

We knew little about Shu-How Lin, a basketball player from New York Knicks, __________ we watched the basketball matches in NBA.

There is no air________water on the moon.

This room is small, it's clean and comfortable.

It's not always safe to pay over the Internet, ______ you should be careful.

There were few doctors then, ________ Bethune had to work hard on his own.

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