Hardly _____the classroom when the class began.

Hardly _____the classroom when the class began.
A、had he entered
B、he had entered
C、he entered
D、he was entered
【正确答案】：A
【题目解析】：本题考察hardly…when…结构的用法。此结构中hardly一般置于句首，其后的分句采用倒装形式，与as soon as...意思相近，如Hardly had I got home, when the telephone rang.