18. The teacher __________ students in the back row as some of them dozed off in the class.
(A) call at
(B) call for
(C) called on
(D) call out。
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統計: A(13), B(44), C(75), D(42), E(0) #2236389
統計: A(13), B(44), C(75), D(42), E(0) #2236389