難度：★    考點：狀語從句

　　1. We Will go for a picnic if it_______tomorrow.

　　A. doesn't rain    B. wasn't rainy

　　C. won't rain     D. wasn't raining

　　2.-Do you know if we will go for a picnic this Saturday?

　　-I think we will if we            any classes.

　　A. won ' t  have                   B. didn't' t have

　　C. don't  have                    D. aren ' t having

　　3.The bus driver always says to us ,"Don't get off________ the bus stops."

　　A. when          B. while           C .until          D. if

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