第二部分：英语知识运用（共2节，满分40分）
第一节：单项填空（共20小题；每题1分，共20分）
21. Young as he is, David has gained ______ rich experience in ______ society.
A. the; the B. a; 不填 C. 不填; 不填 D. 不填; the
22. I wondered what difficulty he had _________ the plan?
A. to carry out B. carrying out C. carried out D. with carrying out
