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
為什麼答案是 A
"must have been" 表示對過去事實的肯定推測，符合前句過去式 "were flooded" 的時間背景與語意。
載入中…
"must have been" 表示對過去事實的肯定推測，符合前句過去式 "were flooded" 的時間背景與語意。
