Once ______ , the plan can’t be changed.A．beginB．beginningC．beganD．begun
题型：不详难度：来源：
Once ______ , the plan can’t be changed.| A．begin | B．beginning | C．began | D．begun |
|
答案
| D |
解析
| 考查非谓语动词。Begin与the plan为动宾关系所以用过去分词做状语。句意：一旦开始这项计划不能再做改变。 |
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