__ It is so late. Our son __________ be back .
__ Don’t  worry . I dare say he ________ have some extra work to do.
A．can ; mustB．will ; mightC．should ; mustD．must ; may
B
考查情態(tài)動(dòng)詞。Will在這里表示推測(cè)，可能，想必，might have done,表示對(duì)過(guò)去可能性的推測(cè)。句意：如此的晚了，我們兒子這時(shí)候會(huì)回來(lái)的。別擔(dān)心，我敢說(shuō)他可能有一些額外的工作要做。所以選B。
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