作业帮Mary with two cats_____in the yard when Wenchuan earthquake happened.A.is playing B.was playing C.a
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Mary with two cats_____in the yard when Wenchuan earthquake happened.A.is playing B.was playing C.a
Mary with two cats_____in the yard when Wenchuan earthquake happened.A.is playing B.was playing C.a
Mary with two cats_____in the yard when Wenchuan earthquake happened.A.is playing B.was playing C.a
B
看with最前面的人称选择单复数,因此mary是第三人称单数
由于后面的happend,所以是过去式
综上,选b
B.
when引导的时间状语从句，一件事情在发生的时候，另一件事也正在发生。
B
Mary is in 【组】Two
Mary with two cats_____in the yard when Wenchuan earthquake happened.A.is playing B.was playing C.a
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