问题补充:
Look at the young men. They the bus.
A. are running for
B. are run
C. is running
D. run for
答案:
(答案→)A. are running for
B. are run
C. is running
D. run for
解析:此题重点考查现在进行时的基本构成;look,是现在进行时的基本标志。
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