填going,因为before是介词,介词后跟v-ing形式作宾语.
we must clean our teeth before 什么 （go）to bed
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相关问题
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we should brust our t____ before we go to bed
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选择 we must go to bed ——night A when B before
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⒈You must finish your homework before you go to bed.
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—Must we do something to keep our country clean?—__________.
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改错He must finish his homework before he go to bed.
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We must finish our work before we go home改为同义句
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You must finish your homework before you go to bed同义句