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14.I have two sisters,_______ are teachers.

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14.I have two sisters,_______ are teachers.
A.both of who B.both of whom
C.both of them D.whom of both
who 和whom的区别、详细解释下、、
14.I have two sisters,_______ are teachers.
答案B
whom是宾格,现在常用于介词后;如果不在介词有,用who也行
如:
By whom was the work done?
Who was the work done by?
Tom is a clever boy,whom/who everyone likes.