【题目】We believe you have been devoted to naturally of great necessity.
A. that; being B. all that; be
C. that all; are D. what; is
在线课程【答案】D
【解析】
考查宾语从句。句意：我们相信你所投入的自然是非常必要的。分析句子可知，believe后接宾语从句，宾语从句中to为介词后接what作宾语，所以连接词为what，故what you have been devoted to 为主语，谓语动词为第三人称单数is。故D选项正确。