15. The government has begun installing full-body scanners and other high-tech facilities to_______ security at
Taiwan Taoyuan International Airport.
(A) fall through
(B) carry on
(C) beef up
(D) stand for
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統計: A(22), B(82), C(120), D(67), E(0) #3228959
統計: A(22), B(82), C(120), D(67), E(0) #3228959