18.When students read texts, they must be able to recognize logical connectors and the situations ______ they appear.
(A)by which
(B) in which
(C) so that
(D) thus
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統計: A(69), B(678), C(20), D(16), E(0) #1878927
統計: A(69), B(678), C(20), D(16), E(0) #1878927