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—Mary,I don’t know ____ you can come tomorrow morning.
—No problem! I’ll be here _____I’m free then.

A.if;ifB.if; whetherC.whether;tillD.whether;until

A

解析试题分析:if是否,如果;whether是否;till直到;until直到,常和not搭配使用;句意:玛丽,我不知道明天上午你是否能来。——没问题。如果那时候,我有空,我会到这儿的。结合语境可知上文为宾语从句,下文为条件状语从句,故选A。
考点:考查连词。

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