The question mark can be used within a sentence (not just at the end of it) if wished, although you might prefer to use commas and leave the question mark for the end of the sentence it’s your choice, as both ways are correct. For example, take the situation of someone leaving their house in a hurry before a disaster and wondering what they might have time to take with them. The sentence could be written both of the following ways, noting that the second way provides a lot more emphasis:

• Would I have time to take my car, my horse, my photo album, my laptop, my favorite clothes and jewelry?
• Would I have time to take my car? my horse? my photo album? my laptop? my favorite clothes and jewelry? Note that you do not need capital letters as it remains one sentence.

In this sentence, the question marks are known as “interrupters” and either emphasize each of the separate question fragments, or show the close-linked nature of them.