when he _____something useful,he wasted his time drawing little pictures.a.must have done b.shall be doing c.should be doing d.should have been doing
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when he _____something useful,he wasted his time drawing little pictures.
a.must have done b.shall be doing c.should be doing d.should have been doing
D
should是情态动词,表推测.
have been doing是现在完成进行时,表示从过去到现在一直在做某事.
情态动词should与动词原形连用时表示“应该做某事”,与进行时连用时表示“应该正在做某事”,与现在完成时连用时表示“本应该做了某事”(实际上没有做),与现在完成进行时连用时表示“本应该一直在做某事(实际上不在做)”.
句意:(以前,)当他在本该做有用的事情的时候,他却浪费时间画小人画.
wasted是过去式,排除A、B.
C项:should表推测,应该.he should be doing something useful意思是“他应该在做某件有用的事”,这与后面的事实相矛盾.排除C.
D
过去应该做某事 用过去完成式 should have done
本来该做有用的事的时候 他却浪费时间在画小人画
d 过去本应该做某事但没做
当他本应该做些有用的事的时候,却将时间浪费在画小人画上
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