If it was not an accident he must have done it .A. on purposeB. for purposeC. in timeD.

问题补充：

If it was not an accident, he must have done it .

A. on purpose

B. for purpose

C. in time

D. with care

答案：

(答案→)A. on purpose

B. for purpose

C. in time

D. with care

解析：考查词组：A. on purpose故意地，B. for purpose没有这个词组，C. in time及时的，迟早，D. with care关心的，句意：如果这不是一场事故，他一定是故意做的。选A。