问题：
“If I ________ taking drugs, I would be a successful businessman now,” said the dying drug addict.
A．didn’t start
B．haven’t started
C．hadn’t started
D．shouldn’t start
“If I ________ taking drugs, I would be a successful businessman now,” said the dying drug addict.
| A．didn’t start | B．haven’t started | C．hadn’t started | D．shouldn’t start |
参考答案：