7

Set 4: Form, Structure & Sense (Intermediate)

Explanation

Answer: C

PASSAGE

Recent studies show that the treaty, signed after years of negotiation, _______ lasting peace between the two nations for over a century.

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

A. ensures
B. has ensured
C. ensured✓ Correct
D. ensuring

Detailed Answer Explanation

[Variation 1] This question tests your understanding of sentence function and text organization. 'The treaty' is singular and 'signed after years of negotiation' is parenthetical. 'Ensured' (past tense) describes a historical result. 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 treaty, signed after years of negotiation"

• "for over a century"

Why others are wrong: A ('Ensures' is present tense; 'signed' indicates past context.), B ('Has ensured' is present perfect; 'for over a century' with historical treaty suggests past tense.), D ('Ensuring' is a participle; the sentence needs a main verb.).