This is ______ that dog.
| A．as a big dog as | B．as big a dog as |
| C．a as big dog as | D．a big as dog as |
Mark needs to learn Chinese________his company is opening a branch in Beijing.
| A．unless |
| B．until |
| C．although |
| D．since |
She says that she’ll have to close the shop ________ business improves.
| A．if |
| B．unless |
| C．after |
| D．when |
I don’t believe we’ve met before，________I must say you do look familiar.
| A．therefore |
| B．although |
| C．since |
| D．unless |
He smiled politely ________ Mary apologized for her drunken friends.
| A．as |
| B．if |
| C．unless |
| D．though |
—Coach，can I continue with the training?
—Sorry，you can’t________you haven’t recovered from the knee injury.
| A．until |
| B．before |
| C．as |
| D．unless |