作业帮Our math teacher___in our school for 20 years and he___here when he was 23 years old.A.has thought ; has come B.thought ; comes C.thought ; came D.has thought ; came
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Our math teacher___in our school for 20 years and he___here when he was 23 years old.A.has thought ; has come B.thought ; comes C.thought ; came D.has thought ; came
Our math teacher___in our school for 20 years and he___here when he was 23 years old.
A.has thought ; has come B.thought ; comes C.thought ; came D.has thought ; came
Our math teacher___in our school for 20 years and he___here when he was 23 years old.A.has thought ; has come B.thought ; comes C.thought ; came D.has thought ; came
选D
1.现在完成时,has taught ...for 20 years,表示一段时间时要与完成时连用
2.一般过去时,后面有表示过去的时间,以when引导的状语从句表示,所以用came .
D,首先动词应该是taught，第一句有for 短语，与完成时态连用；第二句有when引导的状语从句，从句中是过去时，主句也应用过去时
D. has thought ; came
D
for是完成时态的标志词，所以第一空有现在完成时态
看到when，就要用一般现在时和一般过去式，如 I broke my leg when I was 14 years old
这里明显是发生在过去，所以用一般过去时came
还有问题追问哦亲~
D
B
D
选D.teach的过去分词 是taught。FOR+时间段是现在完成时的提示词，表示过去的动作一直延续到现在或者是过去的动作对现在的影响。所以 第一空填has taught。第二空填came。因为后一句是强调过去的动作，所以用过去式。