单选题
If it（ ）possible, I would have helped him, but I was too busy.
A、
is
B、
was
C、
were
D、
had been
【正确答案】
D
【答案解析】
[解析] 本题考查条件句中的虚拟语气。句意：如果有可能，我会帮助他的，但是我太忙了。根据主句的I would have helped him可知从句是对过去发生的事的虚拟，应用过去完成时来表示。所以答案为D。
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