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题目内容
（综合英语）
His friends are not happy with him because he always turns down their invitations （ ） ill health.
选项
A: on the ground of
B: on the strength of
C: in view of
D: by means of
选项
A: on the ground of
B: on the strength of
C: in view of
D: by means of
参考答案
