题目内容
When Liu Fang was ________ holiday, she visited her grandparents.
A. at B. of
C. in D. on
D 【解析】句意：当刘芳度假时，她去看望了她的祖父母。be on holiday去度假，结合句意可知，答案为D。
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题目内容
When Liu Fang was ________ holiday, she visited her grandparents.
A. at B. of
C. in D. on
D 【解析】句意：当刘芳度假时，她去看望了她的祖父母。be on holiday去度假，结合句意可知，答案为D。