问题
选择题
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
答案：C
题目分析：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。