He now regrets______harder when he was at school.A．not to studyB．not studyingC．having not

Had he worked harder, he __________ 怎么选择

______harder, he would have got through the exams.A．Had he workedB．He had workedC．Should h

The Committee regrets that it cannot right now______your group to their Society.A．linkB．af

Barely______at the airport when the police arrested him.A．did he arriveB．had he arrivedC．h

______the door when a gust of wind blew the candle out.A．He had no sooner openedB．Hardly h

Last year he learned______he had expected because he worked a lot harder.A．twice as much a