I'm basically looking at sentences which start with a question, and end with an explanation to it. But there may be more instances of a similar structure. Sample sentence :
Can you book a room in advance, because otherwise we'd be in trouble
Should this sentence end with a period or a question mark?
PS: I read the apparently similar question Position of question mark when sentence doesn't end with question but the sentence structure there is different from what I'm looking for.
Edit: I just discovered that this question is a duplicate. A resolved question already exists: Should I use a question mark when the second independent clause of my sentence is not a question? But i do like the explanations here better.