Question

— Has Sam finished his homework today?　　— I have no idea. He ________ it this morning.　　

— Has Sam finished his homework today?　　— I have no idea. He ________ it this morning.　　 A．did B．was doing C．has done D．had done

Answer 1

B

考查动词的时态。根据this morning可知句子要用一般过去时态的某种形式，且表明今天早晨我看见他时他正在做作业，所以选B。