题目内容
【题目】It's our duty _______ our classroom clean and tidy.
A.keep
B.to keep
C.keeping
D.kept
【答案】B
【解析】题意：保持教室干净整洁是我们的责任。用到了It's one's duty to do sth.故选B。
练习册系列答案
相关题目
题目内容
【题目】It's our duty _______ our classroom clean and tidy.
A.keep
B.to keep
C.keeping
D.kept
【答案】B
【解析】题意：保持教室干净整洁是我们的责任。用到了It's one's duty to do sth.故选B。