. It is usually warm in my hometown in March, but it _________ be rather cold sometimes.
A．mustB．can
C．shouldD．would
B。
can表示推測(cè)時(shí)通常只用于否定句或疑問(wèn)句，很少用于肯定句。但有兩種情況是例外（即可用于肯定句）：一是表示純理論上的可能性，二是表示“有時(shí)”，如：Even experienced teachers can make mistakes. 即使是有經(jīng)驗(yàn)的教師也可能出錯(cuò)。She can be very unpleasant. 她有時(shí)很令人討厭。
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