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题型：单选题题类：常考题难易度：普通

—How long does it take to get to the airport?
—Forty minutes. But it's foggy today. I'm not sure the highway will closes soon. Let's set off earlier.

A、whether B、when C、how D、why

举一反三

I don't know if mum a gift for me. If she one, I will be very happy.

I am not sure ______ Tom can come to my birthday party or not.

— Are there any questions about the camp?

—Yes, I want to know_________ next Saturday.

—I am not sure_______________________.

— Oh, it depends on personal taste.

I want to know if you{#blank#}1{#/blank#}(come) to my home tomorrow. If you come, I{#blank#}2{#/blank#}(go) to meet you.

We really want to know ____.

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