问题
Never before ________ buying a computer, but now it seems a necessity in my everyday life.
A:did I think of
B:have I thought of
C:I thought of
D:I have thought of
B:have I thought of
C:I thought of
D:I have thought of
正确答案是：
同类题型
The old man lives ____ in the ______ forest, but he never feels ______.
Sometimes smiles ______ be false, hiding other feelings like anger, fear or worry.
Luo Yang devoted all his life _________for China Nation Aviation(中国航天).
Peter is ________ than you, right?—-Yes, but he is ________ runner in our class.