日日人人_亚洲美女在线视频_av手机在线播放_国产大片aaa_欧美中文日韩_午夜理伦三级

If he ________harder , he will catch up with us soon .

A.  study     B. studies    C. will study    D. studied

If he _______ harder, he will catch up with us soon.         

A. study                      B. studies                    C. will study         D. studied

If he ________ harder, he will catch up with us soon.

A. study

B. studies

C. will study

D. studied

If he ______ harder, he will catch up with us soon.

A. study

B. studies

C. will study

D. studied