问题
选择题
—What has happened to Tom?
—He is so tired after ______ walk.[ ]
A. three hours
B. three hours'
C. three hour's
D. three hour
答案
答案：B
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—What has happened to Tom?
—He is so tired after ______ walk.[ ]
A. three hours
B. three hours'
C. three hour's
D. three hour
答案：B