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

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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