my parents --at home on weekends Aare all B.are both C.all are D.both are
问题描述：
my parents --at home on weekends Aare all B.are both C.all are D.both are
答
my parents B.are both at home on weekends
答
my parents 【are both】at home on weekends Aare all
B.are both C.all are D.both are
选择A
答
B
parents 父母亲（ 两个人） ,排除A C ,而BOTH 要放在BE动词后,再排除D
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