阿摩線上測驗
22、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 been
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統計： A(56), B(5), C(26), D(5), E(0) #2963966
統計： A(56), B(5), C(26), D(5), E(0) #2963966
