1."What did Mr.Smith say about his career?" "Only that if he____a millionaire,he would have fewer worries."A.did not becomefB.had not becomefC.does not becomefD.has not become

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1."What did Mr.Smith say about his career?" "Only that if he____a millionaire,he would have fewer worries."
A.did not becomef
B.had not becomef
C.does not becomef
D.has not become

b,虚拟语气.但是前面的问题是过去时,所以回答中加上虚拟语气需要提前的时态而变成过去完成时.