问题补充:
The little boy felt grateful the couch for his letting him the game.
A. for; join in
B. to; to join
C. to; join in
D. with; join
答案:
A. for; join in
B. to; to join
(答案→)C. to; join in
D. with; join
解析:考查介词和词组:句意:小男孩对教练很感激,因为他让他参加比赛。Be grateful to sb,排除AD。join in参加活动,join是参加组织,let sb do让某人做…所以选C。