题目内容
When Marx was in London, he _____ read at the library for hours.
| A．would | B．might | C．could | D．should |
Awould表示过去的习惯性动作, would 后跟行为动词，不跟表示状态的动词，往往有时间状语，而used to表示过去的习惯动作时后跟的动词无限制，无需有时间状语，如：
I used to like chocolate. (√)
When I was a child, I would like chocolate. (×)
I used to be a university student. (√)
I would be a university student. (×)
I used to like chocolate. (√)When I was a child, I would like chocolate. (×)I used to be a university student. (√)I would be a university student. (×)
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