单项选择题
With the advancement of technology, computers have come into the market ______ capable of doing very complicated calculations at great speed.
单项选择题 His son has become a doctor, ______ he wanted to be.
单项选择题 The main road through Littlebury was blocked for three hours today after an accident ______ two lorries.
单项选择题 In our apartment there are three rooms, ______ is used as a living-room.
