2. 外语
  3. Sam knows a biologist______owns a well-equipped laboratory.

Sam knows a biologist______owns a well-equipped laboratory.

admin2013-11-24  26
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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