As______clear from his manners, he is a teacher.A、beingB、isC、to beD、beenB关系分

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问题 As______clear from his manners, he is a teacher.

选项 A、being
B、is
C、to be
D、been

答案 B

解析 关系分句。as意为“如,照(某种事实或情况)”,在本句中为关系代词,指代第二个分句,as代替整个句子作主语时,谓语动词通常必须用单数。
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