Tom used to be a lazy boy,he () while his classmates were studying.A.were sleeping B.was sleepingC.sleeping D.sleeps

问题描述:

Tom used to be a lazy boy,he () while his classmates were studying.A.were sleeping B.was sleeping
C.sleeping D.sleeps

Tom used to be a lazy boy,he () while his classmates were studying.
A.were sleeping B.was sleeping
选B.
因为Tom 是【单数名词】
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