用所给单词的正确形式填空 what do you think is ____ ___ ___(useful)invention in the word.

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用所给单词的正确形式填空whatdoyouthinkis__________(useful)inventionintheword.用所给单词的正确形式填空whatdoyouthinkis_______

用所给单词的正确形式填空 what do you think is ____ ___ ___(useful)invention in the word.
用所给单词的正确形式填空 what do you think is ____ ___ ___(useful)invention in the word.

用所给单词的正确形式填空 what do you think is ____ ___ ___(useful)invention in the word.
the most useful