__ 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)動詞。Will在這里表示推測，可能，想必，might have done,表示對過去可能性的推測。句意：如此的晚了，我們兒子這時候會回來的。別擔(dān)心，我敢說他可能有一些額外的工作要做。所以選B。
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