题目内容
12．Be quiet!The baby_____．（ ）| A． | sleeps | B． | slept | C． | are sleeping | D． | is sleeping |
分析 安静！婴儿正在睡觉．
解答 答案：D．通过 be quiet．"请安静"，可知，小孩应该正在睡觉，所以应该用现在进行时．现在进行时的结构是be+doing．而the baby是单数．故谓语也应用单数is，所以本题选D．
点评 本题考查现在进行时的用法．对于时态的考查，应该注意动作发生的时间，根据时间来确定不同的时态．所以找句中的时间是本题的关键．
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