His friends are not happy with him because he always turns down their invitations（ ）ill health.
A.正确答案Aon the ground of
B.on the strength of
C.in view of
D.by means of
His friends are not happy with him because he always turns down their invitations（ ）ill health.
His friends are not happy with him because he always turns down their invitations（ ）ill health.
A.正确答案Aon the ground of
B.on the strength of
C.in view of
D.by means of
