问题标题：
【1.Ireallydon'tknowwhere----------A.itisboughtBitisboughtCdidhegoDhewent答案是D2.Mybrotherbecameinterestedinmusic-------?AuntillastyearBattheageofeighteenCsincefiveyearsDsincethreeyearsago但是为什么】
问题描述：
1.Ireallydon'tknowwhere----------A.itisboughtBitisboughtCdidhegoDhewent答案是D
2.Mybrotherbecameinterestedinmusic-------?AuntillastyearBattheageofeighteenCsincefiveyearsDsincethreeyearsago但是为什么C与D不能选呢还有since后面跟的是什么是一段时间还是.
3.Toplantthetree,the__mustbeneithertoowetnortoodry,andwemustdig_____.
A.floor,athree-foot-deephole
Bgroundathreefeetdeephole
Cfloorathree-feet-deephole
Dgroundaholethreefeetdeep
但是不知道为什么ABC错在哪里
段铁群回答：
1.where后加陈述语序
2.since用在一般完成时态
3.首先,种树的地应该是ground,后一个空应该是ahole(that)threefeetdeep,后者修饰前者,that可以省略
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