单选题 10.  —Tom! What's that?
    —There are two girls behind you. ______ You've just noticed?
    —I don't get why anybody does that anymore. It's so annoying!
【正确答案】 A
【答案解析】 顺接前文“在你后面有两个女孩”,此句应该是那两个女孩的所作所为。其他选项上下逻辑不通。