问题

You can’t pass the exam ______ you study harder.
A:unless
B:if
C:when
D:so
B:if
C:when
D:so
正确答案是:
同类题型
e are young, questions of _______wewant to be when we grow up are common.
ese changes willlead to stronger China, countrythat can surprise and enrich our planet
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