规则
Use a comma after an introductory word, phrase or dependent clause that comes before the main sentence.
主句前的引导词、短语或从句后要加逗号。
✔ 正确： After the storm passed, volunteers cleared the roads.
✘ 错误： After the storm passed volunteers cleared the roads.
→ 改正： Add a comma after "passed".
技巧: Look for openers such as "Although…", "After…", "In 2020…", "However…" and end them with a comma.
练习：10题
Which choice completes the text so that it conforms to the conventions of Standard English?
由AUSLEX原创的讲解和题目，并非College Board官方资料。SAT是College Board的商标。