It is necessary that dental Atechnicians and others Bworking with X-rays limit C

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问题 It is necessary that dental Atechnicians and others Bworking with X-rays limit Ctheir exposure to Dthis highly penetrating rays.

选项 A、
B、
C、
D、

答案 D

解析 This is a singular demonstrative. The plural form is needed before highly penetrating rays. Correction: these

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