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题型：单选题题类：真题难易度：普通

___________I am in trouble, my classmates will help me out.

A、Before B、Whenever C、Although

举一反三

Everyone can make great progress _______ he works hard.

It's raining outside, you'd better take your umbrella.

_____the scientists have done lots of research on Mars, there is still much waiting to be discovered.

Mike is late，but we must wait he comes．

Alan, you can't go out to play football ______ you clean your room.

The meeting won't be put off it rains heavily.

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