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43.Shemusthavegoneoutearly,()shehadnotshownupatbreakfast.a.becauseb.sincec.ford.therefore

题目详情
43.She must have gone out early,( )she had not shown up at breakfast.
a.because
b.since
c.for
d.therefore
▼优质解答
答案和解析
B 因为选a和c应该带有明显的因果关系,而这道题只是猜测,之前有说must.
d就更不对了,d的意思是因此.而这里是因为.