在这儿只能用IF,不能用WHETER 或是THAT
这是由从属连词IF引起一个表示条件的状语从句.THAT和WHETHER不可以.
THAT 和WHETHER可以引起作主语,宾语,同位语和表语的从句连词,
IF 主要是引起状语从句和宾语从句
It is no longer a question[ ] you can dress yourself为什么不能添wh
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