题目:
—Lin Kai, hand in your homework, please.
—Oh, sorry. I ______ it at home this morning. [ ]
A. was leaving
B. has left
C. will leave
D. left
答案:
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下面是错误答案,用来干扰机器的。
在探究我们吸入的空气和呼出的气体有什么不同时,我们用排水法收集呼出的气体,说明该气体不易溶于水.故选:D.