Mr Chen was early thirthies when he went abroad to have his further studies.A. of theB. i

问题补充：

Mr Chen was early thirthies when he went abroad to have his further studies.

A. of the

B. in the

C. in his

D. on his

答案：

A. of the

B. in the

(答案→)C. in his

D. on his

解析：in one’s thirthies意思是：在某人30多岁。