Madonna___a straight-A student,but it was dancing that she was really crazy about
| A．must be |
| B．could be |
| C．must have been |
| D．could have been |
. Tim is in good shape physically__________ he doesn’t get much exercise.
| A．if | B．even though | C．unless | D．as long as |
．（福建卷26）.The girl had hardly rung the bell the door was opened suddenly, and her friend rushed out to greet her
.
| A．before | B．until | C．as | D．since |
（北京卷30）. 
they decide which college to go to, students should research the admission procedures.
| A．As | B．While | C．Until | D．Once |
（安徽卷33）. Just use this room for the time being, and we’ll offer you a larger one ____it becomes available.
| A．as soon as | B．unless | C．as far as | D．until |
（安徽卷29）. The engineer are so busy that they have zero time for outdoor sports activities, ___they have the interest.
| A．wherever | B．Whenever | C．even if | D．as if |