1. The roller coaster at the amusement park will be closed next Thursday for routine _______ checks.
(A) exhibition
(B) interference
(C) maintenance
(D) perfection
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統計: A(21), B(4), C(159), D(2), E(0) #1772738
統計: A(21), B(4), C(159), D(2), E(0) #1772738