I ____ him the answer ____ possble.,but I was so busy then.A.could tell,if it had beenB.must have told,were itC.should have told,had it beenD.should have told,should it be

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I ____ him the answer ____ possble.,but I was so busy then.A.could tell,if it had beenB.must have told,were itC.should have told,had it beenD.should have told,should it be
I ____ him the answer ____ possble.,but I was so busy then.
A.could tell,if it had been
B.must have told,were it
C.should have told,had it been
D.should have told,should it be

I ____ him the answer ____ possble.,but I was so busy then.A.could tell,if it had beenB.must have told,were itC.should have told,had it beenD.should have told,should it be
C:should have done表示本应该做某事(而没做)
had it been应该是if it had been, 但是前面用的是虚拟语气,这个后面的句子应该用倒装句,所以改为had it been.也表示虚拟.
这句话翻译为: 如果当时可能的话,我本应该告诉他答案的,但是我当时太忙了.
祝你进步.