There are three girls in the room is Tom's sister. A. the tallest of which B. the talles

问题补充：

There are three girls in the room, is Toms sister.

A. the tallest of which

B. the tallest of whom

C. tallest of that

D. tallest of which

答案：

A. the tallest of which

(答案→)B. the tallest of whom

C. tallest of that

D. tallest of which

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