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

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

The students can answer questions.They have to put up hands.(用 before 改成简单句)
The students can answer questions.They have to put up hands
=The students have to put up hands before they answer questions.

The students have to put up hands before they can answer questions.