单选题Exactly when the first&nb

问题补充：

单选题Exactlywhenthefirstpeoplearrivedin________wenowknowasCalifornia,noonereallyknows.A.whichB.whatC.thatD.it

答案：

B解析考查宾语从句。宾语从句What we now know as California作为介词in的宾语。What引导起该宾语从句，在句中作为动词know的宾语。