问题描述：
（1）She had three sons,all____became doctors.A of which B which C who D of whom (2) The pencil__
（1）She had three sons,all____became doctors.
A of which B which C who D of whom
(2) The pencil___I wrote is gone.
A that B by which C with it D with which
（1）She had three sons,all____became doctors.
A of which B which C who D of whom
(2) The pencil___I wrote is gone.
A that B by which C with it D with which
问题解答：
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