6．---Large quantities of time ______ been spent on the discussion．
---Yes，and most students are now for the requirement that all the students      not take their cell phones into the classroom．（　�。�
A．is； willB．has； canC．are； mustD．have； should

分析 --大量的時間都花在了討論．
--是的，現(xiàn)在大多數(shù)學(xué)生的要求是，所以學(xué)生不應(yīng)該把手機帶進教室．

解答 答案：D．主語Large quantities of time是復(fù)數(shù)，句子是現(xiàn)在完成時，所以用have，can not 表示不可能、不可以；must not 表示禁止做什么；should not 表示不應(yīng)該做，結(jié)合語境，這里是學(xué)生不應(yīng)該把手機帶到教室，故選D．

點評 考查主謂一致．謂語動詞應(yīng)與前面的主語保持一致，并且注意句子的時態(tài)．

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