【題目】Alipay is a useful ________ (invent)．It makes people's life more convenient.

【答案】invention

【解析】

句意為：支付寶是一個(gè)有用的發(fā)明。它使人們的生活更便利了。分析句子成分可知此處缺少名詞作表語(yǔ)，故填invention。

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