she will sing a song____she is asked.

来源：百度知道 编辑：UC知道 时间：2024/05/05 07:28:20
she will sing a song____she is asked.
A.if B.unless C.for D.since 请问选哪一个 为什么呢？ 谢谢

if
原因不太好说，语感是if

unless
应该这样说：she wouldn't sing a song , unless she were asked.

for since
应该这样说：she sung a song, for/since she had been asked.

A
如果选B的话就是She won't sing a song unless she is asked.
不选CD，因为此句是条件状语从句，不是原因从句
Understand？

A

be+V-ed是被动语气。。

这个句子里是说，如果她被人要求的了话，她就会唱歌。

if，表示如果迈~~条件句哈。

选 A if
意思是 如果(大家）要求，她会唱首歌。

A
如果他被要求 那他会唱一首歌