单选题
Scarcely does anyone want to become janitors, but to be appointed as a
sanitary
engineer is quite something else.
A、
senior
B、
military
C、
clean
D、
skilled
【正确答案】
C
【答案解析】
sanitary(有关)卫生的，清洁的。四个选项：clean清洁的；senior年长的，资格老的；military军事的，军用的；skilled熟练的。
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