摘要： A.a hour B.half hour C.half a hour D.half an hour
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Half an hour's exercise a day ________ doctors away.
A. keep
B. keeps
C. is keeping
D. kept
查看习题详情和答案>>It _____ half an hour to walk from the city library to the post office.
[ ]
A. takes
B. spends
C. pays
D. costs
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B. spends
C. pays
D. costs
It _______ half an hour to finish drawing this picture.
[ ]
A. spends
B. talks
C. costs
D. takes
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B. talks
C. costs
D. takes