In the morning the streets were flooded. There \_\_\_\_ a cloudburst during the night.
Amust have been正確答案
Bhas been
Cmust be
Dmust to be
答案與詳解
"must have been" 表示對過去情況的肯定推測(過去一定發生了),符合前句過去式 "were" 與過去時間 "during the night" 的語境。
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