阿摩線上測驗
31. In the morning the streets were flooded. There ______ a cloudburst during the night.
(A) must have been
(B) has been
(C) must be
(D) must to be
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統計： A(78), B(14), C(22), D(6), E(0) #3446509
統計： A(78), B(14), C(22), D(6), E(0) #3446509
