请先看题目：

They weren’t a particularly good team, but they refused to give in and _________ defeat.

A. accept                  B. accepted              C. accepting             D. to have accepted

容易误选B，误认为 accepted 与谓语 refused 并列。其实，最佳答案为A，动词 accept 与 give 并列。请看类例：

(1) Mother told Jim to watch the milk until it boiled and then _________ off the gas.

A. turn                     B. turning                 C. turned                  D. having turned

答案为A，turn off the gas 与 watch the milk until it boiled 并列。

(2)He just does what he pleases and never _________ about anyone else.

A. think                    B. thinks                   C. thinking                D. thought

答案选B，thinks 与前面的 does 为并列谓语，同用一般现在时。

(3)I don’t know whether to stay in teaching or _________ another job.

A. trying getting        B. to try to get           C. trying to get          D. try get

答案选B，to stay in teaching 与to try to get another job 为两个并列的选择成分，故同用不定式。另外比较：try to do sth=设法做某事，try doing sth=做某事看看有何效果。