单项选择题

Industry analysts were surprised by how ______ the economy recovered from recession.

(A) quick
(B) quickly
(C) quicker
(D) quicken
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单项选择题
The speaker decided to ______ talk about the company's history before explaining his plans for its future.
(A) brief
(B) briefs
(C) briefly
(D) briefing
单项选择题
Anyone who enters the factory floor should wear a helmet and safety vest at ______ times.
(A) any
(B) all
(C) every
(D) each
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