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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.
admin
2019-07-01
46
问题
It is necessary that dental A
technicians
and others B
working
with X-rays limit C
their
exposure to D
this
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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