Question

要解释，要答案，要翻译，解释具体点，谢谢

要解释，要答案，要翻译，解释具体点，谢谢1.Don’t hurry. The bus won’t start___everybody gets on.
A. since B. as
C. until D. when

2.He hasn’t heard from his friend __________ last month.
A. since B. by the end of
C. for D. until
有什么不一样的地方

Answer 1

第一题：选C.until意为直到...时
译为：别担心，巴士会在每个人都上车之后才发车
A.since意为自从...之后；B.as意为当...；D.when意为当...的时候
第二题：选A.since
因为题目中用了现在完成时,而since一般是现在完成时的标志
如果题目是这样：
He didn't hear from his friend________last month.
那么这道题就应该选until

Answer 2

Don’t hurry. The bus won’t start until everybody gets on.
A. since B. as   C. until D. when

not ...until直到……才……

别急，直到所有人都上了车，车才开。

2.He hasn’t heard from his friend since last month.
A. since B. by the end of  C. for D. until
从上个月以来我就没有收到他的来信。

since+过去时间点，句子完成时态。

Answer 3

1选C。
根据题意结合生活常识可知，公交车在所有人上车以后才会发动，时间关系是 not...until。

2选A。
从上个月开始他就再没收到朋友的来信了。如果选D，时态与叙述的内容就发生了矛盾。

Answer 4

---- 1. 答案； C
-----2.答案； A