During the discussion, Mr. Boyd remained silent when asking his opinion.

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问题 During the discussion, Mr. Boyd remained silent when asking his opinion.

选项 A、During the discussion
B、remained silent
C、when
D、asking

答案D

解析 应改成asked。在本句中要用被动语态,完整的句子为:“when he is asked”。本句的意思是:“在讨论过程中,当博伊德先生被问到他的看法时,他保持沉默。”
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