问题描述：
英语关于时态的选择题
Dinosaurs are though to_____millions of years ago.
A die out
B have died out
C having died out
D dying out
选择什么好呢?我选择了A
Dinosaurs are though to_____millions of years ago.
A die out
B have died out
C having died out
D dying out
选择什么好呢?我选择了A
问题解答：
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