单项选择题

A．He lost his notes.
B．He missed the class.
C．He is doing research on alternative fuels.
D．He’s studying for a test.
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单项选择题
A．Playing the guitar.B．Working at a restaurant.C．Singing in a rock concert.D．Dancing in a ballet recital.
A．Playing the guitar.
B．Working at a restaurant.
C．Singing in a rock concert.
D．Dancing in a ballet recital.
单项选择题
A．onceB．usuallyC．everD．even
A．once
B．usually
C．ever
D．even
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