—This returned Chinese scholar has become one of the top experts in this field.
—Yes , I know him very well. He ___________ in Africa with wild animals for eight years.
| A．has worked | B．had worked | C．worked | D．has been working |
—Are you content with her lecture?
—Nowhere near that. It ____.
| A．may have been good | B．couldn’t have been worse |
| C．can’t be better | D．must be better |
A British man who ____ to play practical jokes ____ his own humorous art work in four major New York museums over the last two weeks.
| A．liked; has secretly hung | B．likes; has secretly hung |
| C．had liked; secretly hung | D．has liked; secretly hung |
____ nearly all behavior is learned behavior is a basic assumption of social scientists.
| A．/ | B．That | C．It is acceptable | D．When |
I know the man by ____ but I have never spoken to him.
| A．chance | B．heart | C．sight | D．experience |
My command of English is not ____ yours.
| A．as half as | B．so half good as |
| C．good as half as | D．half so good as |