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1.I don't know if it______ tomorrow.if it ____,we will go to

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1.I don't know if it______ tomorrow.if it ____,we will go to climb the hills.
A.rains;doesn't rain
B.will rain;won't rain
C.rains;won't rain
D.will rain;doesn't rain
(是A还是D,为什么)
2.Do you have a hard time _______(work)out these math problems?
D
前一个是if引导的宾语从句,从句看时间状语,是将来时间就用将来时
working 固定短语 做某事困难 have a hard time doing