It’s the third time that Li Ming has been to Xi’an , _______?
| A．isn’t he | B．hasn’t he |
| C．isn’t it | D．hasn’t it |
However, at times this balance in nature is disturbed, _______ a number of possibly unforeseen effects.
| A．lying in | B．calling in | C．taking in | D．resulting in |
I want an assistant with _______ little knowledge of French and _______experience of office routine.
| A．the; a | B．the; an | C．a; 不填 | D．a; an |
—How nice it tastes!
—In fact，this delicious cake is not difficult________.
| A．making | B．made | C．to be made | D．to make |
One of the greatest benefits of stamp－collecting is that they are based on common interests，________ appearance，age or wealth.
| A．other than | B．or rather | C．rather than | D．instead |
It is ________ he often fails in exams ________ makes his parents worried about him.
| A．what；that. | B．that；what. | C．that；that. | D．because；that. |