If you’ve finished we can have a coffee. you’d better keep working.A. If soB. Only ifC.

问题补充：

If you’ve finished, we can have a coffee. , you’d better keep working.

A. If so

B. Only if

C. If not

D. If only

答案：

A. If so

B. Only if

(答案→)C. If not

D. If only

解析：If so如果这样的话；Only if只要；If not如果不是这样的话；If only要是……该多好。根据句意故选C。