【題目】My mother goes to Beijing(two) a year.

【答案】twice
【解析】句意:我的媽媽一年去兩次北京。two 二,是一個(gè)基數(shù)詞。根據(jù)句意可知,這里表示他的媽媽去北京的頻率,twice兩次,twice a year一年兩次。故填twice。

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