摘要：16．-Has Sam finished his homework today?
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－Has Sam finished his homework today?
－I have no idea．He ________ it this morning．
[ ]
A．did
B．has done
C．was doing
D．had done
－Has Sam finished his homework today?
－I have no idea．He ________ it this morning．
[ ]
A．did
B．has done
C．was doing
D．had done
－Has Sam finished his homework today?
－I have no idea. He ________ it this morning.
[ ]
A．did
B．has done
C．was doing
D．had done