问题

Only when he failed the exam ________ that he didn’t work hard. (原创)

A:he regretted
B:did he regret
C:had he regretted
D:does he regret

正确答案是：

同类题型

The survey __________ our school last month shows that about 2 percent of the students are addicted to Internet games.

Sherlock Holmes asked the suspect what he ___ when the murder took place.

The seriously __________ people in the car crash were taken to hospital to be treated.

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life like quarrels or fights harms one’ heart