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單項選擇題

Through the open window we saw on the floor the happy father lying （） his stomach, his daughter riding excitedly on his back.

A.on
B.with
C.above
D.from

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Usually the teachers will be busy （） the test papers after an examination.

A.grading
B.naming
C.ranking
D.grouping

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The problem, according to the experts, is （） we should do with the salty land.

A.what
B.whether
C.how
D.that