It was my sister first had the idea to cycle along the entire Mekong River.A. whoB. whomC

发布时间：2020-08-16 14:31:38

It was my sister      first had the idea to cycle along the entire Mekong River.
A. who
B. whom
C. /
D. which

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(答案→)A. who
B. whom
C. /
D. which
解析：修饰名词sister是一个定语从句，先行词表示人，关系词在从句中作主语可用who，故本题选A。
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