---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

1. A.
   which
2. B.
   that
3. C.
   when
4. D.
   since

---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.