Free SAT Practice Question

Question 1 of 1
ID: DSAT-RW-75
Section: Digital SAT Reading & Writing (RW) - Broadly Writing - Standard English Conventions
Topic: Form, Structure, and Sense
Difficulty level: Medium

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In recent years, astronomers using space-based infrared telescopes have monitored thousands of stars for periodic dimming events. When infrared observations reveal a sudden dip in a star's brightness, researchers ______ a transiting exoplanet, triggering follow-up spectroscopy to characterize its atmosphere.

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

Adetect
Bto detect
Chaving detected
Ddetecting
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