题目内容

选择填空:

The waitress was busy ______ the customers.   

[　　]

A. serve　　B. serving　　C. to serve　　D. served

答案：B
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______ do the students' parents have to pay for their education?

[    ]

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选择填空:

Tom ______ the plane because he got up too late.

[　　]

A. failed to catch　　B. not caught

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