When Marx was in London, he _____ read at the library for hours.
A．wouldB．mightC．couldD．should
A
would表示過去的習慣性動作, would 后跟行為動詞，不跟表示狀態(tài)的動詞，往往有時間狀語，而used to表示過去的習慣動作時后跟的動詞無限制，無需有時間狀語，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.           (×)
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