Please talk in a low voice ,because the twins_________.A.sleepB.is sleepingc.sleptD.are sleeping

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Please talk in a low voice ,because the twins_________.A.sleepB.is sleepingc.sleptD.are sleeping

Please talk in a low voice ,because the twins_________.A.sleepB.is sleepingc.sleptD.are sleeping
Please talk in a low voice ,because the twins_________.
A.sleep
B.is sleeping
c.slept
D.are sleeping

Please talk in a low voice ,because the twins_________.A.sleepB.is sleepingc.sleptD.are sleeping
D
因为twins是两个人,所以用复数.
而且是正在睡觉.

d

D are sleeping
正在睡觉 所以是D

D