問題詳情
18. I can’t find my purse. I _____ it when I got off the bus.
(A) must drop
(B) must have dropped
(C) can’t have dropped
(D) may drop
(A) must drop
(B) must have dropped
(C) can’t have dropped
(D) may drop
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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