单选题
He had studied hard , he would have been able to pass the exam.
A、
He had studied harder
B、
If only he studied more
C、
Had he studied harder
D、
When he studied more
【正确答案】
C
【答案解析】
语态应用。本句是虚拟语气，从句省略“if”，应用倒装语序。
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