[单选题]7.这20年间，世界发生了翻天覆地的变化。时而波澜壮阔，令人振奋；时而风雨如磐，惊心动魄。
AOver the past 20 years, the world has changed greatly. It is sometimes sweeping inspiring it is sometimes stormy disquieting.
BOver the past 20 years, the world has witnessed great changes which are sweeping inspiring at times stormy disquieting at others.
COver the last 20 years, the world has changed greatly, sometimes sweepingly inspiringly sometimes stormily disquietingly.
DOver the last 20 years, the world has witnessed great changes, at times sweepingly inspiringly at others stormily disquietingly.
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