题目内容
About ____ gene-targeting drugs are already in testing pipeline. It won’t be long ____ they are put into effect.
A. two dozen; before B. two dozens; that C. two dozens of; before D. dozens; that
A
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About ____ gene-targeting drugs are already in testing pipeline. It won’t be long ____ they are put into effect.
| A．two dozen; before | B．two dozens; that | C．two dozens of; before | D．dozens; that |
About _______ gene-targeting drugs are already in testing pipeline. It won’t be long ______ they are put into effect.
|
A．two dozen; before |
B．two dozens; that |
|
C．two dozens of; before |
D．dozens; that |