. Although their new factory building is still under ________ construction, we have already placed _______ order for 200 pairs of shoes.
| A．the ; an | B．a; an | C．/; / | D．/; an |
难度: 中等查看答案及解析
. The ancient Chinese vases _______ display attracted lots of experts and collectors, some of whom suggested they______ on the next fair.
|
难度: 中等查看答案及解析
. --- My son is addicted to drugs. He isn’t hopeless, is he?
--- Yes, ______ he mends his way and starts all over.
| A．if | B．when | C．even if | D．unless |
难度: 中等查看答案及解析