8

Set 5: Form, Structure & Sense (Advanced)

Explanation

Answer: D

PASSAGE

The genome sequencing data, corroborated by independent laboratories on three _______ confirms the existence of a previously unidentified genetic variant.

Which choice completes the text so that it conforms to the conventions of Standard English?

A. continents;
B. continents:
C. continents
D. continents,✓ Correct

Detailed Answer Explanation

This question tests your understanding of sentence function and text organization. The participial phrase 'corroborated by independent laboratories on three continents' is parenthetical. A comma closes this phrase before 'confirms.' Each sentence in a well-constructed text serves a specific purpose. Consider what role this sentence plays in the argument: does it introduce, support, contrast, or conclude an idea? Understanding why an author includes specific sentences helps you grasp the overall argument. Each sentence should serve a clear purpose: introducing ideas, providing evidence, acknowledging counterarguments, or drawing conclusions. Identify the role to understand the structure.

Key Evidence:

• "The genome sequencing data, corroborated by independent laboratories"

• "confirms the existence"

Why others are wrong: A (A semicolon is too strong for closing a participial phrase.), B (A colon doesn't fit for closing a participial phrase.), C (Missing punctuation fails to close the parenthetical phrase.).