第二部分：英语知识运用（共两节，满分35分）
第一节：单项填空（共15小题；每小题1分，满分15分）
21. These young seedlings will require _______ carefully.
A. look after B. looking after
C. having looked after D. to have looked after
22. The manager promise to keep me ______ of how our business was going on.
A. to be informed B. informed C. on informing D. informing
