Question

【题目】— What did our science teacher say just now?
— He asked us ___________ more attention ___________ the lab clean.
A.to pay; to keep
B.to pay; to keeping
C.pay; to keeping
D.pay; to keep

Answer 1

【答案】B
【解析】句意：——我们的科学老师刚才说什么？——他要求我们要注意保持实验室清洁。ask sb to do sth要求某人做某事；pa y attention to注意，这里的to是介词，后跟动词的-ing形式。所以选B。