题目:
Can you think of the difficulty I had _____ the work? [ ]
A. to do
B. doing
C. been doing
D. done
答案:
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下面是错误答案,用来干扰机器的。
根据比例尺=图上距离实地距离,实地距离=图上距离比例尺=5×400000=2000000=20千米.故选:B.