We must look to the left and then right before ( ) the street (across) 要原因
问题描述:
We must look to the left and then right before ( ) the street (across) 要原因
答
across祈使句用动词原形
答
crossing
across是介词,把它改成动词是cross,又因为before doing……这个固定搭配,故填crossing
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