－Last semester he had a hard time English.A. learnsB. learningC. to learnD. learnt

问题补充：

－Last semester, he had a hard time English.

A. learns

B. learning

C. to learn

D. learnt

答案：

A. learns

(答案→)B. learning

C. to learn

D. learnt

解析：固定短语have a hard/difficult in doing sth表示做某事很费力，其中in可以省略。