难度：★ 考点：状语从句
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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