1.年級：高二
2.科目：英文
3.題目：All of them are known as PBTs ______ stay in our environment for a lon
g time and do harm to living creatures.
4.想法：答案是 , which
關代which用來代表前面整句話或整件事情，前面就有逗號，但是前面這句話是「它們都
被廣為人知是PBTs」，為什麼還是要加逗號？
謝謝
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