I think he is taking an active part in social work. I agree with you .A. in a wayB. on the

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(答案→)A. in a way
B. on the way
C. by the way
D. in the way
解析：句意，我认为他在社会工作中起着一个很积极的作用。在某种程度上我同意你的观点。in a way在某种程度上 on the way 在途中 by the way 顺便一提 in the way 造成不便或阻碍，根据题意，故选A。