【題目】 public bicycles with a mobile app is more convenient for users.

A. To unlock B. Unlock C. Unlocked D. Unlocking

【答案】D

【解析】考查動(dòng)名詞。分析句子結(jié)構(gòu)可知,本句是主系表結(jié)構(gòu),前面的________ public bicycles with a mobile app是句子主語(yǔ),只有動(dòng)名詞和不定式可以充當(dāng)主語(yǔ),動(dòng)名詞作主語(yǔ)往往表示普通的、一般的行為,不定式作主語(yǔ)常表示某次具體的行為。故本題選D。句意:使用移動(dòng)應(yīng)用程序解鎖公共自行車對(duì)用戶來(lái)說(shuō)更方便。

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