1．—Jack, look at what you have done. You are supposed ________ your job by now.
—Sorry, Miss Lee. I'll hurry up.
A．to finish B．finishing
C．to have finished D．having finished
解析：选C 句意：“杰克，看看你都做了些什么。现在你理应已经完成了你的工作。”“抱歉，李老师，我会抓紧的。”be supposed to do sth.“理应做某事”，但语境中的时间状语为“by now”，表明此处应使用不定式的完成式to have done, be supposed to have done sth.“理应做过/做完了某事”。
2．(2019·无锡模拟)While the house prices in WuXi keep rising, a lot of houses have been sold out, ________ most were sold to buyers from Shanghai and Suzhou.
A．in which B．among them
C．of which D．of them
解析：选C 句意：尽管无锡的房价一直在涨，许多房子都已经卖光了，大多数卖给了来自上海和苏州的买主。of which most 相当于most of which, which指代 houses。
3．Our leader ________ bright flashlights so we would not scare away the night creatures we hoped to find.
A．forbade B．shone
C．removed D．collected
解析：选A 句意：为了不把我们希望找到的夜间生物吓跑，我们的领队不让我们使用手电筒。forbid“禁止”；shine“照耀，发光”；remove“去除”；collect“收集”。故选A。
