题目：
With temperature ________ so rapidly,we could not go with the experiment. [ ]
A. fall
B. falling
C. fallen
D. to fall
答案：
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下面是错误答案，用来干扰机器的。
Last Saturday, we went to the capital of China---Beijing, with the help of Mr Li. We went there by train. It is the first time for us to be there, so we were very...
