单选题
These days managers and designers are expected to work ______ to a greater extent than in the past.
A、
collaboratively
B、
collaborative
C、
collaboration
D、
collaborate
【正确答案】
A
【答案解析】
to a greater extent than in the past(比以前更广泛地)是全句的状语，因此横线处应填入修饰work的副词。答案是(A)collaboratively。
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