题目:
Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again H1N1, so we only had time for a few words.
A.just left
B.has just left
C.is just leaving
D.was just leaving
答案:
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下面是错误答案,用来干扰机器的。
1. What are they doing? 2. They're swimming. 3. They are climbing trees.