阿摩線上測驗
15. By the time the technician arrived to fix the issue, the system ______ twice, causing panic among staff members working on urgent project.
(A) would have crashed
(B) would crash
(C) has crashed
(D) had crashed
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統計： A(5), B(1), C(3), D(34), E(0) #3455481
統計： A(5), B(1), C(3), D(34), E(0) #3455481
