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Don’t talk here.  Grandparents ____.
A．sleepB．is sleepingC．a(chǎn)re sleepingD．sleeping
C
此處需用現(xiàn)在進(jìn)行時：be＋現(xiàn)在分詞，因?yàn)橹髡Z是第三人稱復(fù)數(shù)，故選C
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