—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

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�！獩]問題。如果那時(shí)候，我有空，我會(huì)到這兒的。結(jié)合語境可知上文為賓語從句，下文為條件狀語從句，故選A。
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