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About _______ gene-targeting drugs are already in testing pipeline. It won’t be long ______ they are...
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 |
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