问题补充：
It was playing computer games that the boy plenty of time that he doing
his lessons.
A. spent; must have been
B. cost; ought to have spent
C. wasted; wouldn’t have been
D. took; can’t have spent
答案：
A. spent; must have been
(答案→)B. cost; ought to have spent
C. wasted; wouldn’t have been
D. took; can’t have spent
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