作业帮英语关于时态的选择题Dinosaurs are though to_____millions of years ago.A die outB have died outC having died outD dying out选择什么好呢?我选择了A
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英语关于时态的选择题Dinosaurs are though to_____millions of years ago.A die outB have died outC having died outD dying out选择什么好呢?我选择了A
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
英语关于时态的选择题Dinosaurs are though to_____millions of years ago.A die outB have died outC having died outD dying out选择什么好呢?我选择了A
答案是B,在这里是固定结构ab/sth be thought to have done sth:某人或某事被认为曾经做了---用to have doone的原因是后面的millions of years ago.
本题的意思是：恐龙被认为几百万年前就已经灭绝了.
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选B
B.have died out
vhguhjkl;
B吧，恐龙已经灭绝了，而不是将要灭绝啊
应该选B吧！因为这句话的意思是：恐龙被认为是在数百万年以前就已经灭绝了。灭绝的这件事情是在数百万年以前就已经发生了，所以要用完成时态。还有be think to do sth 的意思是：被认为做某事。
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b
选B。
be thought to have done sth某人被认为曾经做了，用于对过去的猜想，换成主动就好理解了We think dinosaurs died out millions of years ago.
be thought to do sth 用于一般现在时，例如：Tom is thought to be a good student.
我觉得应该选A ago表示的是从现在算起一段时间以前，和动词过去式连用
答案是B，首先看ago这个词，说明本句是过去时。而前面是不定式结构，不定式的过去时结构为to have done.所以，答案是B.
be thought to have done sth某人被认为曾经做了，用于对过去的猜想
be thought to do sth 用于一般现在时
所以选B