In the sentence I'd better have passed my test __ it's ninety percent of my class grade or I'll have to go to summer school, which punctuation best fills the blank?

• A. Colon
• B. Dash
• C. Comma
• D. Semicolon

Answer: (B)

The punctuation here shows a sharp, connected thought with a strong pause that emphasizes the link between the warning and its consequence. Using a dash after “test” gives a quick break and then explains why the test matters—“it’s ninety percent of my class grade”—and what will happen if it isn’t passed. That dash keeps the flow tight and dramatic, highlighting the cause-and-effect relationship in one breath. A comma would create a run-on by forcing two independent statements together without proper conjunctions. A semicolon would divider the ideas too formally and doesn’t signal the added emphasis as clearly. A colon would feel like you’re simply explaining the first part, which isn’t quite the right fit for this sentence.