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题型：单选题题类：常考题难易度：普通

——When did your father come back last night?
——He didn't come back _______ he finished all the work.

A、until B、while C、if D、unless

举一反三

Rose， you are so thin. You should eat more， you'll make yourself ill.

—Does your grandpa often walk the dog after supper?
— Yes, _________ bad weather stops him.

It's a good habit to wash your hands you have meals.

While Mike _______ for his dog, he fell into a river.

______________ you feel sick, please go to see the doctor,

Go straight ahead along this road, ___ you will see the hospital.

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