问题
选择题
People should think about _____ they can have a positive influence on the planet.
A．why
B．that
C．what
D．how
答案
答案：D
考查宾语从句。 宾语从句How they can have a positive influence on the planet作为think about的宾语。本句主要是从句意出发。句意：人们应该考虑他们怎么样才能对地球有积极的影响。