[单选题]What a relief! We would be still waiting anxiously in the classroom _______to bring an umbrella with you.
A.should you forget
B.had you forgotten
C.you should forget
D.you had forgotten

参考答案:B

【详解】
考查虚拟语气。句意：真是松了一口气！如果你忘了带雨伞，我们还在教室里焦急地等着。本句是省略if引导的错综时间虚拟语气句，还原句子为：We would be still waiting anxiously in the classroom if you had forgotten to bring an umbrella with you，“一直等“这个动作发生在现在，表示现在的情况，所以主句谓语用would +动词原形，“忘记”这个动作发生在过去，表示与过去事实相反，从句谓语应用过去完成时（had done），在虚拟语气中，若有had/were/should等助动词，可将其提到句首，省略if变成为倒装句式，即had you forgotten to bring an umbrella with you。故选B项。