简单选择题
1. when__, the metal expands, and if __ to cool it will contract.
a. heated, allow. b. heated, allowed
2. neither of the two parties__able to solve the problems of the poor.
a. is b. are
请说明
参考答案:1. when__, the metal expands, and if __ to cool it will contract.
a. heated, allow. b. heated, allowed
选:b. heated, allowed 过去分词表被动.
2. neither of the two parties__able to solve the problems of the poor.
a. is b. are
选:a. is neither作第三人称单数看待.