Silk ______ one of the primary goods traded along the Silk Road by about 100BC．（ ）
| A． |
had become |
B． |
was becoming |
| C． |
has become |
D． |
is becoming |
﹣﹣Are you sure you're ready for the test？
﹣﹣_________．I'm well prepared for it．（ ）
| A． |
I'm afraid not |
B． |
No problem |
| C． |
Hard to say |
D． |
Not really |
The party will be held in the garden, weather_________.
| A．permitting | B．to permit |
| C．permitted | D．permit |
I have two elder brothers, ____ in the army for ten years.
| A．the elder of whom served |
| B．the older having served |
| C．the older of which served |
| D．the elder one has served |
Nothing could be done at the meeting, the chairman_____ absent.
| A．being | B．was |
| C．to be | D．be |
Bats are surprisingly long-lived creatures, some ____________ a life span of around 20 years.
| A．having | B．had |
| C．have | D．to have |