when a hypothesis is wrong, scientists often begin by revising the (blank)
after that, its common for a scientist to redesign the (blank)
A.question
B.hypothesis
C.experiment
D.conclusion

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I might be wrong, but. The words seem to fit. 

When a hypothesis is wrong, scientists often begin by revising the question after that, its common for scientists to redesign the experiment.
When a hypothesis is wrong , scientists often begin by revising the hypothesis and redesign the experiment