Forensic scientists, who Awork in crime laboratories, Bconduct testing that Chelp law enforcement agencies Dsolve crimes.

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问题 Forensic scientists, who Awork in crime laboratories, Bconduct testing that Chelp law enforcement agencies Dsolve crimes.

选项 A、
B、
C、
D、

答案C

解析 Help is a plural verb. The relative pronoun that refers to testing, an uncountable noun that needs a singular verb. Correction: helps.

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