The reason      he was late for school was      he had to send his mother to a hospital.

The reason      he was late for school was      he had to send his mother to a hospital.

A．which; that        B．why; that          C．for which; because  D．what; why

The reason      he was late for school was      he had to send his mother to a hospital.

1. A.
   which; that
2. B.
   why; that
3. C.
   for which; because
4. D.
   what; why

The reason _______ he raised for being late with the exercise was ______he had to send his mother to school.    

A. that, that      B. why, because  C. why, that    D. that, because