将拇指屈曲、腕尺偏出现疼痛是用来检查：

A．拇指屈肌腱腱鞘炎

B．尺骨茎突滑囊炎

C．腕三角软骨损伤

D．桡骨茎突腱鞘炎

E．腕桡侧副韧带损伤

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