. _____ available, we would certainly have sent him to the meeting.
. _____ available, we would certainly have sent him to the meeting.
A、John was
B、Wasn’t John
C、Had John been
D、John had been
【正确答案】：C
【题目解析】：C available 随时可来的；certainly一定；省略if的虚拟条件句，句首倒装。主句为：would have done时，从句应为：had been(done).
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