1.haven't been able to是“已经不能”的意思,could是“曾经不能”的意思
2.have to或should都可以,但must口气过重,有种不穿校服就要拖出去毙了的感觉了
3.should表“竟然”时会与疑问词连用
4.同第2题的解释
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