When you’re learning to drive a good teacher makes a big difference. A. haveB. havingC. a

问题补充：

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

A. have

B. having

C. and have

D. and having

答案：

A. have

(答案→)B. having

C. and have

D. and having

解析：这是一个含 when引导时间状语从句的主从复合句，having a good teacher在主句中用作主语。

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