1. 關係副詞=介係詞+關係代名詞 2. escape from... 逃離;逃脫 所以這題如果有from which也可以選 A black hole is a region of space where the pull of gravity is so strong that nothing can escape. =A black hole is a region of space which the pull of gravity is so strong that nothing can escape from. =A black hole is a region of space from which the pull of gravity is so strong that nothing can escape.