填空题 He could exactly recall when the thought occurred to him, because it was clear he had more than once considered suggesting to the boy that he go out with Miriam.
A. when B. occurred to C. suggesting D. go out
【正确答案】
【答案解析】B：occurred to→had occurred to[解析] 有想法应该是在回想某事之前，过去的过去要求用过去完成时。