ACT English Practice Question #1387 (Medium (30)) | Test Citadel
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ACT English Difficulty: Medium (30)

Digital ACT English Practice Question #1387

Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.

Choose the best option for the underlined portion: The particle accelerator—a seventeen-mile subterranean ring straddling the French-Swiss border—has provided pivotal empirical confirmation of the Higgs boson.
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Check punctuation pairs: Dash matches Dash. Comma matches Comma.

Masterclass Solution & Distractor Trap Analysis

The parenthetical clause began with an em-dash ('—a seventeen-mile...'). To maintain syntactic symmetry, it must be closed with an em-dash before the predicate 'has provided'....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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