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

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(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。