The old man has two sons, ______ are engineers.A、both of themB、both of whomC、b

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问题 The old man has two sons, ______ are engineers.

选项 A、both of them
B、both of whom
C、both who
D、they both

答案 B

解析这位老人有两个儿子，都是工程师。考查定语从句的用法。因为“sons”在句子中作宾语，所以要用“whom”。

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