![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
Before submitting the book reports, proofreading must be done.
A.
This sentence contains a squinting modifier.
B.
This sentence contains both a misplaced modifier and a dangling modifier.
C.
This sentence is correct.
D.
The sentence should be corrected as “Before you submit the book report, proofreading must be done.”