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Toplantthetree,wemustdig_AathreefeetdeepholeBthree-foot-deepaholeCathree-feet-deepholeDaholethreefeetdeep选哪个,为什么?

题目详情
To plant the tree,we must dig_A a three feet deep hole B three-foot-deep a hole C a three-feet-deep hole D a hole three feet deep 选哪个,为什么?
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答案和解析
A是错的因为名词前面缺少正确的形容词,a three feet deep hole应该改 a three-foot-deep hole B是错的因为形容词在冠词前面,three-foot-deep a hole应该改 a three-foot-deep hole C是错的因为复合修饰形容词全部必须是单数形式,应该改 a three-foot-deep hole 所以 只有D是正确选项