This sentence needs a question mark.

这个句子需要一个问号。

This sign looks like a question mark.

这个标志看起来像一个问号。

Why did you use a question mark here?

为什么你在这里用了问号？

You added a question mark at the end of the sentence.

你在句子的末尾加了一个问号。

Put a question mark; put a query

打一个问号

Is really a question mark than he was.

实在是一个问号比他。

I put a question mark there-- it's possible.

在这里存个疑问-,这是可能的值。

Tagline should perhaps have been a question mark instead.

这句标语后面的感叹号或许应被一个问号所替代。

If the last remaining character is a question-mark (?

如果最后剩下的字符是一个问号（“?。

The question mark is used at the end of a question.

问号用在问题的结尾。