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题型：单选题题类：常考题难易度：普通

We will go for a picnic if it_____ this weekend.

A、will rain B、rains C、won't rain D、doesn't rain

举一反三

-- Are you going to Sam's birthday party the day after tomorrow?

-- I'm not sure. I will go with you if I _______.

I _______ you a ring if I hear anything.

If you ________this experiment, you will understand the theory better.

If there {#blank#}1{#/blank#} fewer trees, there {#blank#}2{#/blank#} more pollution.

If she stops smoking, she {#blank#}1{#/blank#}. (be healthier)

It is hard to review the knowledge we learn in class ___________ we take notes.

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