GMAT考满分App
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多个动作的句子其动词时态应由句子的意思来决定：
◆ She WAS PLAYING with her friends when the babysitter ARRIVED.
◆ She PLAYED with her friends when the babysitter ARRIVED.
第一个句子表示当babysitter 来的时候she 正在play with her friends. 第二个句子表示当babysitter 来了以后 she play with her friends .
把网站装进口袋
随时随地练习