39. One of the reasons for his being late to work today is _____ he was stuck in a traffic jam for a while.
(A) what
(B) it
(C) that
(D) this
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統計: A(370), B(166), C(1776), D(84), E(0) #2764495
統計: A(370), B(166), C(1776), D(84), E(0) #2764495