公共英语二级
单选题There is a bad smell here．
0h，dear!I＿＿＿the gas．
0h，dear!I＿＿＿the gas．
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味”，由此推知，“我”一定是“忘了”关煤气了。
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