问题补充：
The teacher asked us to keep quiet.
Which kind of structures does the sentence belong to?
A. S+V+DO
B. S+V+P
C. S+V+IO+DO
D. S+V+DO+OC
答案：
A. S+V+DO
B. S+V+P
C. S+V+IO+DO
(答案→)D. S+V+DO+OC
解析：考查基本句型结构。ask sb to do sth让某人做某事，sb是直接宾语，不定式是间接宾语。故选D。
