题目内容
17．--How often does Lara play the trumpet？--_____ once or ________ a week，I'm not sure．（ ）
| A． | May be，twice | B． | Maybe，twice | C． | Maybe，two time | D． | May be，two time |
分析 --劳拉多久吹一次小号？
--也许一个星期一到两次，我不确定．
解答 答案：B．考查情态动词．句意"--劳拉多久吹一次小号？--也许一个星期一到两次，我不确定．"．第一个空，maybe是副词，意思是"也许、可能"，常位于句首．在may be中，may是情态动词，be是动词原形，两者构成完整的谓语形式，与主语形成系表结构，意为"也许是、可能是"．因此A，D不正确．第二个空，time表示次数时，是可数名词，因此C不正确．twice两次，答案是B．
点评 这里要分清may be和maybe的区别，还要掌握twice和two times的用法，结合语境 选择合适答案．
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