单项选择题

They hold a party to observe their 30^th marriage anniversary.

A. watch
B. understand
C. explain
D. celebrate

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单项选择题

This play is so boring that I feel a bit sleepy.

A. interesting
B. exciting
C. lazy
D. dull

单项选择题

A．painfulB．painlessC．enjoyableD．marvelous

A．painful
B．painless
C．enjoyable
D．marvelous

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