He was known to have been hanging about and was not expected to pass the test. , his failure came as no wonder to his parents.
A. However
B. Instead
C. Besides
D. Therefore
网友回答
A. However
B. Instead
C. Besides
(答案→)D. Therefore
解析：考察副词词义辨析。A然而；B代替，而不是；C而且；D因此；句意：人们都知道他一直都在闲逛，没有希望能够通过考试。因此，他的失败对他的父母来说是不奇怪的事情。根据句意说明上下文是因果关系，故使用therefore。故D正确。