下面四项中的标点符号使用正确的一项是（）。
A、老师同他谈过话后，他说：他有决心把学习搞好In1950,oneoftheleadingAmericanwriters()wasawardedtheNobelPrizefortheanti-racistIntruderintheDust.
Thiscarisveryexpensive.Youhavetopayhalfamilliondollars________it.
CollinsCOBUILDEnglishLanguageDictionary(1987)hassomeuniquefeaturessuchasdefinition,extracolumnand______.
Likeallnaturalists,()wasrestrainedfromfindingasolutiontothesocialproblemsthatappearedinhisnovelsandaccordinglyalmostallhisworkshavetragicendings.
Johnhardlyspeakstoanybodyintheclass,________________?
