—Hi Johnson any idea where Susan is?—It's class time so shein the classroom now.A. can

问题补充：

—Hi, Johnson, any idea where Susan is?

—Its class time, so shein the classroom now.

A. can be

B. must have been

C. might have been

D. should be

答案：

A. can be

B. must have been

C. might have been

(答案→)D. should be

解析：考查情态动词。根据Its 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。