公共英语二级

单选题
一There is a bad smeU here.
一0h,dear!I___________me gas.

A.must forget tuming off
B.must forget to turn off
C.must have forgotten tuming off
D.must have forgotten to tum off

参考答案:D进入在线模考

本题考查情态动词表示推测。推测已经发生过的事情,用must have done。forget to do sth.表示忘记去做某事(事情没有做);forget doing sth.表示忘记做过某事(事情已做)。第一句指出,“这里有一股难闻的气昧”,由此推知,“我”一定是“忘了”关煤气了。

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