—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

解析試題分析:if是否,如果;whether是否;till直到;until直到,常和not搭配使用;句意:瑪麗,我不知道明天上午你是否能來(lái)!獩](méi)問(wèn)題。如果那時(shí)候,我有空,我會(huì)到這兒的。結(jié)合語(yǔ)境可知上文為賓語(yǔ)從句,下文為條件狀語(yǔ)從句,故選A。
考點(diǎn):考查連詞。

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