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
答案：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 |