如何检查一个句子是否是一个有空格的问句？

def is_question_with_space(sentence):
    words = sentence.split(" ")
    if len(words) > 1 and words[-1] == "?":
        return True
    else:
        return False

# 示例用法
sentence1 = "你是谁？"
sentence2 = "这是一个句子"
sentence3 = "这是一个有空格的问句吗？"

print(is_question_with_space(sentence1))  # False
print(is_question_with_space(sentence2))  # False
print(is_question_with_space(sentence3))  # True