I must be off now. My friends ________ outside.
A．waitB．have waitedC．a(chǎn)re waitingD．were waiting
C

試題分析：考查時態(tài)。根據(jù)上文的must be說明是對現(xiàn)在的情況進行說明，因為“must+動詞原形”說明對現(xiàn)在的情況進行推測。故C正確。句意：我現(xiàn)在必須得走了，我的朋友在外面等我。
點評：時態(tài)的考查要放在上下文的語境中進行，同時也要注意句子的關(guān)鍵的時間狀語。
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