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---Did you catch what the teacher said?

---No. She spoke so fast _______ I couldn’t hear her very clearly. 

A. which                               B. that                                  C. when                               D. since

---Did you catch what the teacher said?
---No. She spoke so fast _______ I couldn’t hear her very clearly. 

---Did you catch what the teacher said?

---No. She spoke so fast _______ I couldn’t hear her very clearly. 

A．which              B．that                 C．when               D．since