Question

 (2011年烟台四校联考)________suddenly occurred to him that his parents should have arrived in Beijing by this time.

A．What                           B．It

C．That                            D．As

Answer 1

解析：选B。考查句型。句意：他突然想起来，他的父母现在应该到北京了。此句中的it作形式主语，后面的从句为真正的主语。注意句型It occurred to sb.that...某人(突然)想起/想到……。