问题补充:
Don’t talk here. Grandparents .
A. sleep
B. is sleeping
C. are sleeping
D. sleeping
答案:
A. sleep
B. is sleeping
(答案→)C. are sleeping
D. sleeping
解析:此处需用现在进行时:be+现在分词,因为主语是第三人称复数,故选C
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