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3.If my armtouches(触摸) the wall,I have to wash it again.

分析 如果我的手臂触到墙,我必须再洗一次.

解答 答案:touches.if引导的条件状语从句,主句含有情态动词,从句用一般现在时,主语my arm,touch动词,故touches.

点评 If条件句使用如下:
1.主语用一般将来时,从句用一般现在时表将来;
2.主句一般现在时或含情态动词can,may,must,should等,从句一般现在时;
3.主句为祈使句,从句也常用一般现在时.

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