While walking in the grass,you___watch out for snakes.They are very dangerous.
题目
While walking in the grass,you___watch out for snakes.They are very dangerous.
A.can B.may C.must D.will
答案
C.must 必须
翻译过来你就懂了:过草地的时候一定要小心蛇.它们很危险的.
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