He did his best to make themwhat he meant but it didn’t help.A. understood B. understand

问题补充：

He did his best to make themwhat he meant, but it didn’t help.

A. understood B. understand C. to understand

答案：

解析：非谓语动词考查题。make 后的宾补用省略to的不定式即动词原形。 句意：他尽力使他们明白他的意图但是没用。