单项选择题
The (first) Olympic (Games) (in) modern (time) took place in 1896.
A. first
B. Games
C. in
D. time
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单项选择题
In order to (attain) our objective, it is (essential) that we (will make) the best use of the limited resources (available).
A. attain
B. essential
C. will make
D. available
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单项选择题
(Those of us) who work in chemical (laboratories), should have (their) lungs (checked) quite regularly.
A. Those of us
B. laboratories
C. their
D. checked
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