You should make a careful plan the experiment.A. before to doB. before doingC. after to d

发布时间：2020-08-16 10:12:16

You should make a careful plan      the experiment.
A. before to do
B. before doing
C. after to do
D. after doing

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A. before to do
(答案→)B. before doing
C. after to do
D. after doing
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