It is _____ that every effect must have a cause.A.sure B.cer

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It is _____ that every effect must have a cause.A.sure B.certain C.certainly D.surely
为什么A是错的呢?
It's too late.We ____ leave now A.would rather B.cannot help C.might as well D.had to 为什么选C呢?

选B,It's certain that ...固定句型
再问：那第二题呢？
再答：选C,might as well,还不如、最好的意思，后面接动词原形，这个句子的意思是：我们还不如/最好现在离开吧！
再问：是不是第二题如果选B的话，题目要改为leaving，选D的话应该是have to ?
再答：不能选B,can't help doing的意思是情不自禁，不能自抑想去做某事，用在这里不合适，我们情不自禁要走了，这样说不通，很怪。have to的话，我觉得是可以的。

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