He is always helping people without expecting anything.A. in chargeB. in turnC. in trouble

问题补充：

He is always helping people without expecting anything.

A. in charge

B. in turn

C. in trouble

D. in return

答案：

A. in charge

B. in turn

C. in trouble

(答案→)D. in return

解析：考查介词短语辨析。A负责；B依次，轮流；C麻烦中；D作为回报；句意：他总是不期待任何回报地帮助别人。根据句意说明D正确。