2. 外语
  3. They ______ to his birthday party this evening if they have something important to do.

They ______ to his birthday party this evening if they have something important to do.

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问题 They ______ to his birthday party this evening if they have something important to do.
选项 A、needn’t to come
B、don’t need come
C、don’t need coming
D、needn’t come
答案D
解析 need既可作情态动词，也可作实意动词，作情态动词时可以直接加not否定；作实意动词时，在前面加助动词否定，且后跟不定式时，须加不定式符号to，即don’t need to do。故选择[D]。
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