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

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

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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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