摘要： ---Sir, I’m terribly sorry for not having handed in my homework on time, but I have been very busy all these days. ---No excuse for it, but I drop it this time. A. might B. can C. should D. must
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---Sir, I’m terribly sorry for not having handed in my homework on time, but I have been very busy all these days.
---No excuse for it, but I drop it this time.
A．might B．can C．should D．must
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