I mailed the letter two weeks ago.She_____it.A.must receive B.can't receiveC.might receive D.must have receivedNowadays computers _________________ widely in our daily life.A.useB.usedC.will useD.are used

I mailed the letter two weeks ago.She_____it.A.must receive B.can't receiveC.might receive D.must have receivedNowadays computers _________________ widely in our daily life.A.useB.usedC.will useD.are used
I mailed the letter two weeks ago.She_____it.
A.must receive
B.can't receive
C.might receive
D.must have received
Nowadays computers _________________ widely in our daily life.
A.use
B.used
C.will use
D.are used

I mailed the letter two weeks ago.She_____it.A.must receive B.can't receiveC.might receive D.must have receivedNowadays computers _________________ widely in our daily life.A.useB.usedC.will useD.are used
D  must have done 对过去某事的推测,一定是.了,本句意思是她一定是收到了.
D  被动语态,结构是主语+be动词+过去分词,其它三项结构都是错误的,只有D是正确的.
 
 

第一题这里表示的是她一定已经收到了，用过去完成时，所以选D，
第二题总感觉不大对啊。。应该在are和used之间加一个being，不过也许这也可以的吧。。那就选D