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【单选题】
They were in collusion (共谋,勾结) and attempted to their testimony. ( )
A.
retreat
B.
retract
C.
recollect
D.
resume
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Collusive (串通) action among producers creates higher prices for consumers because it
A.
causes overproduction and inefficiency.
B.
creates negative externalities.
C.
forces producers to be more competitive.
D.
allow producers to artificially restrict their supply.