---- Why does the river smell terrible?
---- Because large quantities of water______．
A. have been polluted B. has polluted C. has been polluted D. have polluted
Cathy went to the hospital alone. If she had told me about it, I _____ with her.
A. went B. had gone C. would go D. would have gone
Of all the books on the desk, ______ is of any use for study.
A．nothingB．no oneC．neither D．none
Sam _____ some knowledge of the computer just by watching others working on it.
A.brought up B. looked up C. picked up D. set up
A new iPad in the market costs about ______ of a second-hand one.
A. three times of the price B. three times as much as the price
C. three times the price D. three times more than the price
By the time we arrived at the railway station, the train _________. As a result, we missed the train.
A. left B. is leaving C. had left D. leaves
