—There is a bad smell here. —Oh, dear! I______the gas.

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问题 —There is a bad smell here. —Oh, dear! I______the gas.

选项 A、must forget turning off
B、must forget to turn off
C、must have forgotten turning off
D、must have forgotten to turn off

答案D

解析本题考查情态动词表示推测的用法。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味”，由此推知，“我”一定是“忘了”关煤气了。

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