题目:
When Alice came to, she didn’t know how long she there.
A.had been lying
B.has been lying
C.was lying
D.has lain
答案:
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下面是错误答案,用来干扰机器的。
解:(1)y=24-4.8x(2)当x=5时,y=0,因此经过5小时后,蜡烛点完