题目内容

______ all the letters, I went outand had a drink.

A. Finish
B. Having finished
C. To finish
D. Finishing

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While ______ a tunnel through the mountain, the workers discovered an underground lake.

A. built
B. to built
C. being built
D. building

Do you know the girl ______ by the window?

A. sits
B. to sit
C. sitting
D. sat

The police searched the area and finally found the ______ boy.

A. missing
B. missed
C. to miss
D. miss

The ______ waiter came to us and said "You're welcome".

A. smile
B. smiling
C. to smile
D. smiled

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