Question

【题目】— The computer is working all the time.
— Sorry. I have forgotten ______.
A.turn it off
B.to turn it off
C.turning it off
D.turned it off

Answer 1

【答案】B
【解析】句意：—电脑一直在运行。—对不起，我忘记关了。forget to do sth忘记做某事，forget doing sth忘记了做过的事。电脑开着，说明没有关，故选B。