The professor managed to find some grounds (facts)_________his arguments．
| A．to be based on | B．to base on |
| C．which to base on | D．on which are based |
—— It's no easy task to catch a ticket on a website that receives l billion clicks daily．
一一I can’t agree with you more．Therebe errors for every single step
| A．should | B．must | C．can | D．will |
Progress so far has been very good．We are, __, confident that the work will be completed as expected．
| A．however | B．therefore | C．beside | D．otherwise |
Sometimes, ___ we show our gratitude for a person is reflected in the kind of food we serve him or her．
| A．whether | B．when | C．why | D．how |
Transit, a car made in Jiangxi province, was sold nearly 50,000 units in 2012, with the total value_____ it was in 2008．
| A．more than three times what |
| B．three more times than that |
| C．over three times than what |
| D．over three times of that |
- - How dangerous it was!
- - Yes, but for the passer - by' s quick action, the child _____．
| A．was drowned | B．could have been drowned |
| C．had been drowned | D．should have drowned |