Set 15: Form, Structure & Sense
Explanation
PASSAGE
Intriguingly, researchers have discovered that certain genes, when _______ correctly, can enhance a plant's resistance to drought conditions.
Which choice completes the text so that it conforms to the conventions of Standard English?
Detailed Answer Explanation
[Variation 2] This question tests your understanding of sentence function and text organization. 'When expressed correctly' is a reduced adverbial clause (from 'when they are expressed'). The past participle 'expressed' correctly forms this construction. 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:
• "certain genes, when _______ correctly"
• "can enhance"
Why others are wrong: D ('When will express' creates an awkward future construction.), B ('When expressing' suggests genes express themselves, but genes are expressed.), C ('When are expressing' is grammatically incomplete.).