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(1)She had three sons,all____became doctors.A of which B whi

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(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
D
定语从句,先行词是人,关系代词用who或whom,但是因为要做介词of的宾语,只能用whom
D
定语从句,先行词是物,关系代词用that 或which,但是此处只用which,因为“用笔写”write with a pen ,介词with提前位于关系代词之前,只能用which