Had it been possible I would have gone to attend Monica in the hospital but Ifully occup

问题补充：

Had it been possible, I would have gone to attend Monica in the hospital, but Ifully occupied last month.

A. had been

B. was

C. am

D. have been 过去相反，

答案：

A. had been

(答案→)B. was

C. am

D. have been 过去相反，

解析：考查时态。But后面的句子使用陈述语气，要根据前面的虚拟语气的形式确定后面的时态。如果前面表示与过去相反，那么后面就使用过去时。如果前面前面表示与现在相反，后面就使用现在时。本题前面使用了would have gone,这是一个表示与过去相反的虚拟语气，故后面使用过去时。故B正确。