He spent as much time as he ____over his lessons.

He spent as much time as he ____over his lessons.

题目
He spent as much time as he ____over his lessons.
A.could go B.could going C.couldto go D.went
答案
He spent / as much time as he could / going over his lessons
是这样的,这题中的语法知识是spend doing,as much time as he could是一个整体,楼主看得懂吧.
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