问题描述：
To plant the tree,we must dig＿
A a three feet deep holeB three-foot-deep a holeC a three-feet-deep holeD a hole three feet deep选哪个,为什么?
A a three feet deep holeB three-foot-deep a holeC a three-feet-deep holeD a hole three feet deep选哪个,为什么?
问题解答：
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