Question

（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
请说明一下理由，谢谢了！

Answer 1

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

Answer 2

DD人用who,东西才用which;white with sth

Answer 3

答案：D，D
解释：
第一题：
1、这里考察的是非限制性定语从句的用法。
2、由于先行词是sons，是人，所以关系代词用that或者who、whom，排除AB。
3、all of sons = all of whom 所以答案D正确。

第二题：
1、这里考察的是定语从句的用法。
2、先行词是pencil，是物，关系代词用that或者which，排除C答案。
3、句意是：我写字【用】的那支铅笔不见了。根据句意用介词with，所以正确答案是D。

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