题目内容
Once you want to do something, you must get down _____it well. ( )
| A．do | B．doing |
| C．to do | D． to doing |
D
解析试题分析：句意：一旦你想要做什么，你必须开始认真把它做好。词组get down to doing sth“开始认真做…”，其中的to是介词，后面接不定式，所以选D。
考点：考查词组
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