单项选择题

The Environmental Waste Management Department has failed to find ______ trace of the toxins that were spilled into the river.

(A) others
(B) no
(C) any
(D) none
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单项选择题
Play in the baseball game will ______ as soon as the field has been cleared of the garbage thrown down by fans.
(A) halt
(B) resume
(C) excite
(D) develop
单项选择题
Since the training course, over 30 employees have exceeded their quotas, ______ previously only around 20 had done so.
(A) despite
(B) whereas
(C) unless
(D) because
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