Was it an accident or did David do it ?A. on purposeB. at onceC. in timeD. as usual

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(答案→)A. on purpose
B. at once
C. in time
D. as usual
解析：短语辨析。A故意地；B立刻；C及时；D和平时一样。句意：这是一件偶然的事情还是David有意这样做的？根据句意指有意，故意。故A正确。