题目

________ entering the tall building, he heard a sharp cry coming out of it, which brought his heart to his mouth. A．Upon                                 B．At C．In                                   D．With 答案：解析：句意：他一走进这座高楼，就听到里面发出尖叫声，吓得他心都跳到嗓子眼了。“upon/on＋动名词/名词”意为“一……就……”。 答案：A

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