I find it astonishing that he be so rude to us. I make a plaint to his pany.
A. could; must
B. should; shall
C. shall; should
D. dare; have to
网友回答
A. could; must
(答案→)B. should; shall
C. shall; should
D. dare; have to
解析：考察情态动词。第一空should意为竟然，句意为，我发现他竟然对我们如此粗鲁。
第二空是将来时，意为，我将要向他的公司提出投诉。