18.从下面小题的A、B、C三个选项中选出可以替换划线部分的最佳选项.
---I have studied English for three hours.I'm really tired now.
---You'd better take a break.It's not wise to study all the time.( )
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---I have studied English for three hours.I'm really tired now.
---You'd better take a break.It's not wise to study all the time.( )
| A. | clever | B. | foolish | C. | excited |