Still he could not help thinking that if anything______ the nearest person he could cont
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Still, he could not help thinking that if anything______, the nearest person he could contact by radio, if there was a ship nearby, would be on an island 885 miles away.
A．were happening
B．should happen
C．would happen
D．had happened
请帮忙给出正确答案和分析，谢谢！
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正确答案：B
that从句是thinking的宾语，这个宾语从句又由三个句子构成：ifanythingshouldhappen是宾语从句的条件状语从句，thenearestperson…wouldbeonanisland885milesaway是宾语从句中的主句，hecouldcontactbyradio是定语从句修饰person，iftherewasashipnearby是插入的条件从句。shouldhappen是表示与(过去)将来事实相反的虚拟形式，这一点已由给出的主句谓语动词wouldbe暗示出来，所以其他选项都不是正确答案。