3.To use the pay phone, first pick up the receiver, ________ coins into the slot, listen for a dial tone and then dial the number.
(A) reject
(B) desert
(C) project
(D) insert
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統計: A(13), B(21), C(21), D(194), E(0) #2263144
統計: A(13), B(21), C(21), D(194), E(0) #2263144