The relevant authorities have recently ________ some companies and individuals for their illegal emission that is harmful to the environment. A. cut back onB. cracked down onC. followed up onD. held out on
The relevant authorities have recently ________ some companies and individuals for their illegal emission that is harmful to the environment.
A. cut back on
B. cracked down on
C. followed up on
D. held out on
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“illegal”是 “legal”的反义词。