How many english songs had you learned________the end of last term?How many english songs had you learned________the end of last term?A at B by C till为什么不可以选AC?
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How many english songs had you learned________the end of last term?How many english songs had you learned________the end of last term?A at B by C till为什么不可以选AC?
How many english songs had you learned________the end of last term?
How many english songs had you learned________the end of last term?
A at B by C till
为什么不可以选AC?
How many english songs had you learned________the end of last term?How many english songs had you learned________the end of last term?A at B by C till为什么不可以选AC?
till the end of ,没听过.
at the end of,by the end of
这一对短语的意思都是“在…的末了”、“在…的一端”,意义上相似,但使用场合有所不同.
一般说来,at the end of用于表示具体事物或场所的场合,它也可以用来表示比喻意.例：
The school is situated at the end of the street．
该校位于这条街的尽头.
By the end of用于表示时间的场合,往往含有“不迟于”的意味.值得注意的是,at the end of亦可用于表示时间的场合（见上面第二个例句）,但其义和by the end of有所不同.试对比下面两例：
at the end of January
一月底（指一月份的最后一天）
by the end of January
一月底之前（指一月份结束前的几天）
结合语境 ,又是用于表示时间的场合,所以选B
B by 表示一个时间段，在...之前
句子用的是完成时态，所以应该用表时间段的词，at 和 till 都表示时间点