It remains __________ whether the medicine will work on the human body.
| A．seen |
| B．to seen |
| C．seeing |
| D．to be seen |
相关试题
The key you have just got the front door.
| A．is used to opening | B．is used to be opened |
| C．is used to being opened | D．is used to open |
The expression on her face suggested she was when she heard the news .
A amazing; amazed B. amazed; amazing
C. amazed; amazed D. amazing; amazing
You shouldn’t go out without a coat , it’s rather cold .
| A．unless | B．even though | C．however | D．since |
When ____ different cultures, we often p
ay attention only to the differenced without noticing the many similarities.
| A．compared | B．being compared | C．comparing | D．having compared |
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