They are letting us use their computer and we are giving them the results of our researc

问题补充：

They are letting us use their computer, and we are giving them the results of our research.

A. in charge

B. in place

C. in return

D. in a row

答案：

A. in charge

B. in place

(答案→)C. in return

D. in a row

解析：考查短语辨析。句意“他们让我们用他们的电脑，作为回报，我们给他们我们的研究结果。”A“掌管，负责”；B“在原位”；C“作为回报”；D“一排”。故选C。