My uncle has worked the farm twenty years ago. [

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My uncle has worked            the farm            twenty years ago.        [     ]
A. on, for
B. in, for
C. in, since
D. on, since

答案

举一反三

There is a bookstore_____the second floor.    [     ]
A. in
B. on
C. at
D. to

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           the end of the match, we had kicked four goals.       [     ]
A. At
B. By
C. In
D. On

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There was a game in Watertown where the staff dressed up______clowns to enjoy  kids.    [     ]
A. to
B. as
C. in
D. by

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—How can I get there?
—Take the elevator     __     the fourth floor.       [     ]
A. on
B. in
C. at
D. to

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Children depend______their parents for food and clothing.        [     ]
A. in
B. down
C. on
D. at

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