1.I really don't know where ---------- A.it is bought B it i

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1.I really don't know where ---------- A.it is bought B it is bought C did he go D he went答案是D
2.My brother became interested in music -------?A until last year B at the age of eighteen C since five years D since three years ago 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.To plant the tree ,the __ must be neither too wet nor too dry ,and we must dig _____ .
A.floor ,athree-foot -deep hole
B ground a three feet deep hole
C floor a three-feet -deep hole
Dground a hole three feet deep
但是不知道为什么A B C 错在哪里

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a hole(that) three feet deep,后者修饰前者,that可以省略

I don't know where is it I really don't know()Ikept the secret papers. A it was where 改错句子 I really don't know where it was I left my wallet.怎么改? I really don't know -----with it.A .what to do B.how to do 选 I don't know where it is 和 I don't know where he can go 中 wh I don't know where is my clourful-life.but i just know it ne I really don't know where to I don’t know where the key is,but I suppose I _______ it at i don't know where the bus station is.______ where it is 用 W where is the pencil?用I don't know 为啥不用I can't see it I really don't know what ___(say)about it I really don't know ___ with it.