单项选择题
It’s necessary that young and old people should（）more with each other.
A.communicateB.exchangeC.directD.introduce
单项选择题 The hotel will be the highest building in the city when（）.
单项选择题 The ship is ploughing（）of the Atlantic.
单项选择题 We can’t believe that he drew such a big conclusion according to（）he took for granted.
