题文
It is uncertain ___________ side effect the medicine will bring about，although about two thousand patients have taken it.
| A．that |
| B．what |
| C．how |
| D．whether |
推荐试卷
It is uncertain ___________ side effect the medicine will bring about，although about two thousand patients have taken it.
| A．that |
| B．what |
| C．how |
| D．whether |
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