When you’re learning to drive, _____ a good teacher makes a big difference.

A. have       B. having                C. and have            D. and having

B


解析:

when 引導(dǎo)的是時(shí)間狀語(yǔ)從句，填空句為主句，動(dòng)名詞短語(yǔ) having a good teacher 為主句主語(yǔ)。

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