Was it Tom’s carelessness your keys were lost?
A. because; which
Bfor; what
C. because of; that
D. since; why
网友回答
A. because; which
B. for; what
(答案→)C. because of; that
D. since; why
解析：此题答案错误，考查一般疑问句的强调句型。此题强调的是介词短语做的状语because of，第二空that为强调句型的标志。所以选C。