题目内容：

—Is there anything wrong,Mike?You look sad.
—Oh,nothing much.In fact,I _B______ of my friends back home.
A.had just thought B.was just thinking
C.would just think D.will just be thinking
26.—Can I pay the bill by check?
—Sorry,sir.But it is the management rules of our hotel that payment _C____be made in cash.
A.need B.will C.shall D.can
She just couldn’t believe that her husband,to whom she had been loyal for so
many years,_B_____ desert her after he became rich.
A.might B.should
C.shall D.must
答案已经有了,只是希望哪位高手可以帮忙解析一下用了什么语法知识以及如何分析 ,