have you found a way to solve the problem?no ,I ______it carefully,but I havent come up with one yet.A am cnsidering B considered C have been considering D had considered 为什么不选A C D
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![have you found a way to solve the problem?no ,I ______it carefully,but I havent come up with one yet.A am cnsidering B considered C have been considering D had considered 为什么不选A C D](/uploads/image/z/11825330-50-0.jpg?t=have+you+found+a+way+to+solve+the+problem%3Fno+%2CI+______it+carefully%2Cbut+I+havent+come+up+with+one+yet.A+am+cnsidering+B+considered+C+have+been+considering+D+had+considered+%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E9%80%89A+C+D)
have you found a way to solve the problem?no ,I ______it carefully,but I havent come up with one yet.A am cnsidering B considered C have been considering D had considered 为什么不选A C D
have you found a way to solve the problem?
no ,I ______it carefully,but I havent come up with one yet.
A am cnsidering B considered C have been considering D had considered
为什么不选A C D
have you found a way to solve the problem?no ,I ______it carefully,but I havent come up with one yet.A am cnsidering B considered C have been considering D had considered 为什么不选A C D
后半句是现在完成时,表示过去发生且持续到现在的动作(或与现在有关联的动作),那么前半句时态也必须是表示过去的.用排除法,A是现在进行时,表现在,不对;C是现在完成进行时,强调现在持续进行,不对;D是过去完成时,表示过去的过去,若用此时态,句中必须有对应的表示过去之前的时间状语,但此句没有,因此不选.从句意出发,应选B,或者现在完成时也说得通,但是选项中没有,因此只能选B