题文
He can’t help __ housework, for he is busy __ for the examination.
| A．doing; preparing | B． to do; to prepare | C．doing; to prepare | D．to do; preparing |
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He can’t help __ housework, for he is busy __ for the examination.
| A．doing; preparing | B． to do; to prepare | C．doing; to prepare | D．to do; preparing |
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