Question

Tom ought to ________ me your secret, but he meant no harm.

[　　]

A．have told

B．tell

C．be telling

D．having told

Answer 1

答案：A
解析：

【巧解导析】ought to do用来说现在之事；ought to have done用来说过去之事．根据句中meant可知应用过去时．ought not to have done表示“过去本不必做但实际上却做了”；ought to have done则表示“过去应做而实际却未做”．

提示：

【巧解点悟】判断本题的选项时，要注意本句的时态与ought to后应接动词原形或have done形式．