Grammar第 84 / 120 题
Choose the sentence with correct comma usage.
a.Before the exam we reviewed our notes carefully.
b.Before the exam, we reviewed our notes carefully.
c.Before, the exam we reviewed our notes carefully.
d.Before the exam we reviewed, our notes carefully.
解析
An introductory phrase should be followed by a comma to separate it from the main clause. The comma correctly follows 'Before the exam.'
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