-- There is a bad smell here. -- Oh, dear! I ______ the gas.A、must forget turnin

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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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