【題目】While Kate (write) a letter, a snake appeared.

【答案】was writing
【解析】句意:當凱特在寫信的時候,一條蛇出現(xiàn)了。while后通常用進行時態(tài),本句的appeared是一般過去式,故用過去進行時,所以答案是was writing。

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