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is dangerous _a car at such a high speed.

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is dangerous _a car at such a high speed.
A.to drive B.to driving C.driving D.to be driving请问选哪个及理由
,我也认为选a ,究竟该选哪个?为什么?
is dangerous _a car at such a high speed.
答案是A.
这是一道典型的形式主语的考点.
这个句子如果用它原始的形式来写你可能就更容易理解了:To drive a car at such a high speed is dangerous.这句话的主语是To drive a car at such a high speed,这样长的主语在这个句子中显得过于突兀.
因此我们用it来代替它,然后将它放在后面一点的位置,这样就和谐多了.
It's dangerous to drive a cat at such a high speed.