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问题: 为什么不选择D

It took him almost half an hour to climb____the wall
A.the-three- meter
B.the-three- meters
C.the-three- meter-of
D.the-three- meters of

解答:

The answer is A, it is just like "five-year plan", a "year-old" boy, meter is like adjective.

Since D is the-three-meters with "-" in between words, it is not correct expression. You should not use meters and of in the expression.