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
考查時態(tài)及語態(tài)，保持清醒！你應該知道課上不允許睡覺。根據(jù)語境應用一般現(xiàn)在時態(tài)，且表示被動，所以選C。
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