Question

【题目】His father was very strict with him and he had never praised him ___________he became one of the top students in his grade.

A.unlessB.becauseC.since

Answer 1

【答案】A

【解析】

句意：他的爸爸对他非常严厉，从未表扬过他，除非他成为年级尖子生之一。

考查连词词义辨析。unless除非，如果不；because因为；since自从。根据句中“he became one of the top students in his grade”可知，此处指“如果他不成为尖子生，他爸爸就不会表扬他”，连词unless用在此处符合题意。故选A。