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形容词副词练习题To plant the tree,we must dig _____.A.a three feet d

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形容词副词练习题
To plant the tree,we must dig _____.
A.a three feet deep hole B.three-foot-deep a hole
C.a hole three feet deep D.a three-feet-deep hole
我也窃以为是D,为啥答案是C呢...
而且查了两个资料都是.......
D a three-feet-deep hole 错在feet是foot(英尺)的复数 所以错了!a three-foot-deep hole 就对了!正如:a three-year-old boy一样!记住数词+名词+形容词用于名词之前时,名词一定用单数形式!
另外a hole three feet deep= a three-foot-deep hole