15. Overloaded with work, school teachers now get far less sleep than they    .

A. shall   B. should

C. may     D. might

15.   B考查情態(tài)動詞。句意：在超負(fù)荷的工作下，學(xué)校老師現(xiàn)在的睡眠要比他們應(yīng)該的睡眠少得多。此處should指按道理的推測，意為"應(yīng)該"。根據(jù)句意可知選B。

題目來源：2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練23 情態(tài)動詞和虛擬語氣

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