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题型：单选题题类：常考题难易度：普通

Mozart started writing music ______________ he was four years old.

A、until B、after C、before D、when

举一反三

_______ he is very young, _______ he knows a lot about how to be healthy.

Fire is very important ________ we need to use it to cook food.

—When shall we send the washing machine to you, Mrs. Read?

— on Thursday on Friday, please. I'll be at home then.

Last night, the shop was closed she didn't buy any chocolate.

Work really hard, you can realize your dream of becoming a pilot.

In Yunnan province, there is a valley famous for its butterflies. You will see over four _______kinds of butterflies flying around ________ you get into the valley.

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