规则
A descriptive phrase at the start of a sentence must describe the noun that comes right after the comma. Otherwise it is a dangling modifier.
句首的修饰短语必须修饰逗号后紧接的名词，否则就是悬垂修饰语。
✔ 正确： Walking along the beach, Ana found a fossil.
✘ 错误： Walking along the beach, a fossil was found by Ana.
→ 改正： The person walking (Ana) must come right after the comma.
技巧: Ask "who is doing the opening action?" That noun must follow the 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。