英语定于从句单选.高手进.急
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英语定于从句单选.高手进.急
-do u have any idea when the experiments was carried out?
-.i hear it was not until last year[ ] their plan has been approved.
A.that
B.when
C.before
D.once
答案是B为什么啊 ?还有请翻译一下题目.
答案确定是b,只知道回答部分是个省略句,不清楚为什么选when
-do u have any idea when the experiments was carried out?
-.i hear it was not until last year[ ] their plan has been approved.
A.that
B.when
C.before
D.once
答案是B为什么啊 ?还有请翻译一下题目.
答案确定是b,只知道回答部分是个省略句,不清楚为什么选when
![英语定于从句单选.高手进.急](/uploads/image/z/6949836-36-6.jpg?t=%E8%8B%B1%E8%AF%AD%E5%AE%9A%E4%BA%8E%E4%BB%8E%E5%8F%A5%E5%8D%95%E9%80%89.%E9%AB%98%E6%89%8B%E8%BF%9B.%E6%80%A5)
-你知道这个实验是什么时候开始实行的吗?
-我听说是直到去年才批准的
when在定从里知道前面的last year,在定语从句里做时间状语.last year 是先行词.
-我听说是直到去年才批准的
when在定从里知道前面的last year,在定语从句里做时间状语.last year 是先行词.