the fact（）we may not be able to directly assist you does not mean your complaint isn.t valid. (A) which (B) whom (C) who (D) that

the fact（）we may not be able to directly assist you does not mean your complaint isn.t valid.
(A) which
(B) whom
(C) who
(D) that

出自：新疆工程学院大学英语3

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