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Itwasin1990themedicinewastestedonhumanpatients.A．sinceB．thatC．beforeD．when
题目详情
| It was in 1990 ______ the medicine was tested on human patients.
|
| It was in 1990 ______ the medicine was tested on human patients.
|
It was in 1990 ______ the medicine was tested on human patients.
| A．since | B．that | C．before | D．when |
It was in 1990 ______ the medicine was tested on human patients.
| A．since | B．that | C．before | D．when |
It was in 1990 ______ the medicine was tested on human patients.
| A．since | B．that | C．before | D．when |
It was in 1990 ______ the medicine was tested on human patients.
| A．since | B．that | C．before | D．when |
| A．since | B．that | C．before | D．when |
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B
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