Hardly ____ the classroom when the class began.

Hardly ____ the classroom when the class began.
A、he had entered
B、he entered
C、had he entered
D、he was entered
【正确答案】：C
【题目解析】：Hardly 几乎不，当放在句首时，要引起倒装；had 为助动词，应把助动词提到主语之前，因此C符合题意。