9. The auto industry has experienced one of its most significant trends in the last 50 years, which is the migration of motorists from passenger cars to minivans, sport utility vehicles, and pickups.
(A) The auto industry has experienced one of its most significant trends in the last 50 years, which is
(B) Of the trends the auto industry experienced in the last 50 years has been one of the most significant
(C) In the last 50 years, one of the most significant trends that the auto industry has been experiencing has been
(D) One of the most significant trends that the auto industry has experienced in the last 50 years is
(E) In the last 50 years, the auto industry experienced one of the most significant trends that it has had, that of
答案D。为什么不选C?
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