Sam knows a biologist______owns a well-equipped laboratory.A、whomB、whoC、by who

游客2025-04-17 10

问题 Sam knows a biologist______owns a well-equipped laboratory.

选项 A、whom
B、who
C、by whom
D、to whom

答案 B

解析从句缺少主语，所以用who，whom只能充当宾语。

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