3

Set 4: Form, Structure & Sense (Intermediate)

Explanation

Answer: A

PASSAGE

Intriguingly, the ancient civilization developed advanced irrigation systems, built monumental temples, and _______ extensive trade networks throughout the region.

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

A. established✓ Correct
B. to establish
C. establishes
D. establishing

Detailed Answer Explanation

[Variation 2] This question tests your understanding of sentence function and text organization. Parallel structure requires matching verb forms: 'developed,' 'built,' and 'established' are all past tense verbs. 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:

• "developed advanced irrigation systems, built monumental temples, and"

Why others are wrong: B ('To establish' is an infinitive; other verbs are past tense.), C ('Establishes' is present tense; other verbs are past tense.), D ('Establishing' breaks parallel structure with 'developed' and 'built.').