单项选择题

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
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单项选择题
Before the construction of the railroad, it was prohibitively expensive to transport any goods across the mountains.
A．determinedly
B．incredibly
C．forbiddingly
D．amazingly
单项选择题
His work shed provocative yet necessary light, on an important way to slow the spread of this deadly virus.
A．provisional
B．seductive
C．insulting
D．disturbing
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