设数列{a_n}前n项和为S_n,数列{S_n}的前n项和为T_n,满足T_n=2S_n-n²,n∈N^*.

(1)求a₁的值.

(2)求数列{a_n}的通项公式.

— Hurry up! Alice and Sue are waiting for you at the school gate.

— Oh! I thought they ________ without me.  [ ]

A. went            

B. had gone          

C. have gone          

D. are going