---How often does Lara play the trumpets?--- once or a week.I'm not sure．( )A．May be, twiceB．Maybe, twiceC．Maybe, two timeD．May be, two times 题目和参考答案——青夏教育精英家教网—

7．---How often does Lara play the trumpets？
--- once or a week，I'm not sure．（　　）

	A．	May be； twice		B．	Maybe； twice
	C．	Maybe； two time		D．	May be； two times

分析 --劳拉多久吹一次小号？
--也许一周一到两次，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？--也许一周一到两次，我不确定．"．第一个空，may be也许是，用在这里结构不正确．用副词maybe也许．因此A，D不正确．第二个空，表示两次可以是twice或two times，因此C不正确．答案是B．

点评情态动词无人称和数的变化；不能单独使用，必须与其后的动词原形构成谓语．否定形式通常在后面加not．要注意情态动词的不同用法．

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