must 此處用作情態(tài)動詞,沒有過去式和三單等變化,只用must原形.
翻譯：這個教室這么干凈,剛才一定有人打掃過了.
must 一定,表示推測.
無疑后請采納.
書山有路勤為徑,學海無涯苦作舟.
-----------與君共勉-----------
The classroom is so clean,Someone __must____ clean it just now.為什么用must.just now是表過去啊
The classroom is so clean,Someone __must____ clean it just now.為什么用must.just now是表過去啊
英語人氣：186 ℃時間：2020-04-14 00:35:49
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