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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

－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