One of the main themes of the summit was “sustainable development”,or the question we can continue developing the world without damaging the environment.
A. what
B. how
C. why
D. that
网友回答
A. what
(答案→)B. how
C. why
D. that
解析：本题考查的是同位语的表达。we can continue developing the world without damaging the environment.是作同位语来修饰the question的。