1.We have known each other for---.A.a year and half B.a year

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1.We have known each other for---.A.a year and half B.a year with half C.a year and a half.
2.All---can be done has been done.A.that B.who C.which这两个题选什么.为什么.

1.A a year and half 固定说法,再比如：an hour and half 一个半小时
2.A 先行词all后只能跟that
再问：可是1题答案是C我，不知道为什么，我也以为选A呢，
再答：我弄错了，1的正确答案是C. a year and a half. 一个半小时=an hour and a half

1.We have known each other for---.A.a year and half B.a year we have a music festival each year. We have a Chorus each year [-C3] They two ______ each other for a year. 句型转换1.We have known each other for a long time.（改为一般疑问句）____ He has been here for two and a half year Mike and his parents have ___ to the north for half a year . We have a Art Festival each year错在哪儿 We have(a chorus competition)each year at our school half a year ago. The johns stayed in HeFei （）.A.for half a year B.half a yea three years and half a year