We can hardly believe that an intelligent person like Daniel be asking such a silly question.
A. should
B. might
C. must
D. could
网友回答
(答案→)A. should
B. might
C. must
D. could
解析：句意：我们很难相信象Daniel这样聪明的人竟然会问这里愚蠢的问题。Should“应该，这里表示竟然”，might“可能”，must“必须”，could“能够”，所以选A。