单项选择题
The manager decided to continue the sales for________ two weeks because of the large stock of goods.
单项选择题 Broadband (宽带) connections are widely available now, ________ makes online shopping much easier.
单项选择题 In fact, there are different reasons ________ people are working long hours.
单项选择题 She was quite sure that she ________ the door before she left the office.
