. — His mother was ill and he had to loo
题型：选择题
问题：
.
— His mother was ill and he had to look after her in hospital.
— That’s _________ he was absent from the meeting.
A．because
B．what
C．why
D．which
.
— His mother was ill and he had to look after her in hospital.
— That’s _________ he was absent from the meeting.
A．because
B．what
C．why
D．which