—Hi, Johnson, any idea where Susan is? 
—It’s class time, so she          in the classroom now.
A．can beB．must have beenC．might have beenD．should be
D

這題考查情態(tài)動(dòng)詞的用法，should在這兒表示“主觀推測(cè)、應(yīng)該”，句意是：Johnson知道Susan在哪里嗎？---現(xiàn)在是上課時(shí)間，她應(yīng)該在教室里。
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