题干
. A modern city has been set up in _________ was a wasteland ten years ago.
A：what
B：which
C：that
D：where
答案(点此获取答案解析）
A
A：what
B：which
C：that
D：where
的图像F按向量a平移到F/，F/的解析式y=f(x)，当y=f(x)为奇函数时，向量a可以等于