Stay awake! You should know that it ________ to sleep in class.

A．doesn’t permitB．is not permitted
C．will not be permittedD．was not permitted

B

解析試題分析：考查時態(tài)和語態(tài)。句意：醒醒!你應(yīng)該知道在教室里是不允許睡覺的。根據(jù)句意說明這是一項規(guī)章制度，是一種進(jìn)行時，習(xí)慣性的要求，故使用一般現(xiàn)在時即可，根據(jù)句意可知要使用被動語態(tài)。故B正確。
考點：考查時態(tài)和語態(tài)
點評：英語中的時態(tài)主要由動詞的形式?jīng)Q定，因此在學(xué)習(xí)英語時態(tài)時，要注意分析動詞形式及具體語境，想象在那個特定的時間動作所發(fā)生的背景，這個動作是經(jīng)常性動作、一般性動作、進(jìn)行性動作、完成性動作還是將要發(fā)生的動作。對于語態(tài)，主語和動作之間是主動關(guān)系，就用主動語態(tài)，如果主語和動作之間是被動關(guān)系，就用被動語態(tài)。

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