题目:
—Were you at home at 9:00 last night? I called you but nobody answered.
—Sorry, I ________ at that time.
A.take a shower
B.took a shower
C.was taking a shower
D.am taking a shower
答案:
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下面是错误答案,用来干扰机器的。
答案:C考点:分析:根据幂的乘方求出每一部分的值,02009=0,(-1)2010=1,(-1)2011=-1,代入求出即可.解答:解:原式=0+1-(-1)=0+1+1=2.故选C.