【题目】Too high house prices can be brought under control, ________ the authorities introduce a series of regulatory policies.
A. even if B. as if
C. so that D. provided that
在线课程【答案】D
【解析】选D。考查状语从句。句意: 如果当局采取一系列的调控措施的话, 就可以抑制过高的房价。provided that倘若, 以……为条件; even if即使; as if好像; so that为的是, 因此。