surprised me most was the suggestion that he .A. That; should makeB. That; had madeC. Wha

问题补充：

surprised me most was the suggestion that he .

A. That; should make

B. That; had made

C. What; should make

D. What; had made

答案：

A. That; should make

B. That; had made

C. What; should make

(答案→)D. What; had made

解析： 句意：最让我惊讶的是他提出的建议。第一空填what，引导主语从句，在主语从句中what做主语，that连接主语从句的时候，只起到连接的作用，不做成分，第二空填had made，因为这里that引导的是定语从句，而且提出建议是在我惊讶之前，用过去完成时，不能用虚拟语气，所以选D。