选B.
A中的first为序数词,前面一般加定冠词the,the first意味“第一,首次”等；
B中的first在此处作副词,意为“首先”；
C中一般不用at the first,而是at first,意为“起先,首先,最初”.
因此选B.
Let’s play football．But you have to clean your room __． A．the first B．first C.at the first哪个
Let’s play football．But you have to clean your room __． A．the first B．first C.at the first哪个
英语人气：259 ℃时间：2020-04-01 13:48:08
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