Some robbers are on the prowl, we must be...........
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Correct Answer: Option C
Explanation:
The correct idiomatic expression is "on the alert", meaning vigilant or watchful.
A. alert – grammatically okay but less precise in this sentence.
B. at alert – incorrect usage.
D. for alert – ungrammatical.
The correct idiomatic expression is "on the alert", meaning vigilant or watchful.
A. alert – grammatically okay but less precise in this sentence.
B. at alert – incorrect usage.
D. for alert – ungrammatical.