21. We should contribute_______ to help the poor in developing countries.
A. as much energy as possible
B. energy as much as possible
C. as more energy as possible
D. energy as more as possible
【解析】选A。句意为：我们应该奉献尽可能多的精力去帮助发展中国家的穷人们。as. . . as possible意为“尽可能”, 不用比较级, 故排除C、D。as much/many. . . as与名词搭配时, 只能将名词置于结构中间, 此处much应修饰energy, 故答案为A。
