When a ruler is partly in a glass of water it looks as if it______.A.breaksB.has brokenC.

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When a ruler is partly in a glass of water, it looks as if it______.

A.breaks

B.has broken

C.were broken

D.had been broken

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗