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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