—Tony, you must have noticed the student who broke the glass.
—I'm sorry.I________attentively.
A．studied　B．was studying
C．a(chǎn)m studying　D．would study
B
考查動詞的時態(tài)。由答話人說“對不起”可知，當(dāng)有人打碎玻璃時，他正在專心致志地學(xué)習(xí)，沒有看到打碎玻璃的人。故使用過去進(jìn)行時表示過去某一時間正在做某事，所以答案為B。
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