【題目】It's not a good idea _______ school before you are really ready.
A.to leave
B.leave
C.have left

【答案】A
【解析】句意：在你真正準(zhǔn)備好前離開學(xué)校不是一個好主意。it是形式主語，指代后面的不定式，故選A。

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