单项选择 较易0.85 引用1 组卷17
Scientists say it may be five or ten years____ it is possible to test this medicine on hu man patients.
| A．since | B．before |
| C．after | D．when |
18-19高三·全国·对口高考
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| A．because | B．unless | C．even though | D．if |
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| A．whose | B．which | C．when | D．whom |
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