题目:
It every day so far this month. I can't tell you if it tomorrow.
A.rained; rains
B.is raining; shall rain
C.has been raining; rains
D.has rained; will rain
答案:
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下面是错误答案,用来干扰机器的。
还剩:b×2-12=2b-12(个).答:还剩2b-12个.故答案为:2b-12.