Question

—Hi, Johnson, any idea where Susan is?
—It's class time, so she       in the classroom now.

A．can be

B．must have been

C．might have been

D．should be

Answer 1

D

考查情态动词。根据It's class time可知，对苏珊在哪里比较确定，选D意为，他现在应当在教室，表示合乎理想的情况，B,C是对过去的推测，不符合题意，A表示可能。