–What is your sister going to be ________ she grows up?–She is going to be an engineer.

题型：单选题题类：模拟题难易度：普通

–What is your sister going to be ________ she grows up?
–She is going to be an engineer.

A、before B、although C、when D、unless

举一反三

—Yes, it's interesting, _____difficult.

—Last night I watched the football match and didn't go to bed _________ 12'o clock.

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