【题目】Education has always been a hot topic among parents ______ it is directly related to the future of their children.
A.as
B.in case
C.unless
D.even though

【答案】A
【解析】句意：教育一直是父母们的一个热门话题，因为它直接关系到孩子的未来。A. as“因为”；B. in case“万一”；C. unless“除非”；D. even though“虽然，即使”。此处表原因，故选A.