Question

Exactly when the first people arrived in ________ we now know as California, no one really knows.

A．which

B．what

C．that

D．it

Answer 1

B

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。