I don’t know enough about the machine, so I can’t mend it myself.

A. If I knew enough about the machine, I can mend it myself.

B. If I knew enough about the machine, I could mend it myself.

C. If I know enough about the machine, I can mend it myself.

D. If I know enough about the machine, I could mend it myself.

Ôn thi vào 10 (Viết lại câu)