问题描述：
where is he shopping ______ the mall.
A.for B.at C.on D.from
_____ are they talking____?Their teacher.
A.who ,to B.what ,with C.who ,/ D.what ,to
A.for B.at C.on D.from
_____ are they talking____?Their teacher.
A.who ,to B.what ,with C.who ,/ D.what ,to
问题解答：
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