His grandparents ________ at home on weekends.
A．a(chǎn)re .allB．a(chǎn)re bothC．a(chǎn)ll areD．both are.
B

試題分析：all , both, 表示“都”，“全部”。 both指兩個(gè)人或物，而all指三個(gè)以上的人或物，在句中都可作主語、賓語、表語、同位語或定語；both和all都可直接修飾名詞；名詞前如有限定詞時(shí)，其前只能用both of或all of。both和all在句中的位置是位于be動(dòng)詞之后，行為動(dòng)詞之前，如有情態(tài)動(dòng)詞或助動(dòng)詞，則位于情態(tài)動(dòng)詞或助動(dòng)詞與主動(dòng)詞之間。句意：周末,他的爺爺奶奶都在家.結(jié)合語境可知選B.
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