As well as costing the Middle East dearly in terms of human life, conflict! (冲突) _______ the region around $ 12 trillion since 1991, according to a report by the Strategic Foresight Group.
| A．is also cost | B．had also cost | C．will also cost | D．has also cost |
. If he ________, he _________ that food.
| A．was warned; would not take |
| B．had been warned; would not have taken |
| C．would be warned; had not taken |
| D．would have been warned; had not taken |
He is the only one of the students who _____ a winner of scholarship for three years.
| A．is | B．are |
| C．have been | D．has been |
The Smith’s family, which ____ rather a large one, ____ very fond of their old houses.
| A．were, were | B．was, was |
| C．were, was | D．was, were |
When and where to build the new factory _____ yet.
| A．is not decided | B．are not decided |
| C．has not decided | D．have not decided |
All but one ______ here just now.
| A．is | B．was | C．has been | D．were |