成都清水河公园吃的:是不是虚拟语气？ 在线等

C
如果不倒装的话应该是这样的:If you should have further problems with your printer, contact your dealer for advice.

A

D

if可以引导条件状语从句，是\"假如；如果\"之意，而whether可以引导让步状语从句，是\"不管；无论\" 之意。如：
If you ask him, he will help you.

I shall go, whether you come with me or stay at home.

if和whether用法
if和whether都可译为“是否”，二者引导宾语从句时通常可以互相替换，口语中多用if代替whether。例如：Ask if/whether he plans to come to the meeting. 而以下几种情况中, 只能用whether:
1.强调两方面的选择，特别是句中有or not时。如：
Let me know whether you can come or not.
2.宾语从句前置时。如：
Whether this is true, I can\'t say.
3.引导主语、表语、同位语从句时。如：
Whether the football game will be played depends on the weather. （主语从句）

The question is whether he can do it. （表语从句）

The question whether we should go with them must be decided at once. （同位语从句）
4.在介词之后作介词的宾语时。如：
I haven\'t settled the question of whether I\'ll go back home.
5.在不定式前与不定式一起组成词组时。如：
Whether to go or stay is still a question.
6.在discuss, decide 等动词后作宾语时。如：
We discussed whether we should go there by plane.

in case万一。是连词，引导条件状语从句。也就是说in case后面是一个完整的句子 Take a hat with you in case the sun is very hot. 倘若太阳很利害，你就把帽子戴上。 in case of的of是介词，介词后面只能带名词性质的词，比如名词、代词等。意思和in case差不多，万一的意思 In case of rain they can't go. 万一下雨，他们就不能去了。 in the case of，就...来说, 关于。意思跟上面两个不一样了。一般表示转而提及另一件事情。比如 In the case of woman，they have more difficulty in their job。就女性来说，她们在工作中会遇到更多的困难

选A