The students can answer questions. They have to put up hands.(用before改写成简单句)

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Thestudentscananswerquestions.Theyhavetoputuphands.(用before改写成简单句)Thestudentscananswerquestions.They

The students can answer questions. They have to put up hands.(用before改写成简单句)
The students can answer questions. They have to put up hands.(用before改写成简单句)

The students can answer questions. They have to put up hands.(用before改写成简单句)
把before放在句首,Before the students can answer questions,they have to put up hands.