(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
答案
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……。
In 1800, a group of adventurers set out on their exploring trip. Five days later, they came to _______ is now known as Quebec.
A．what B．which C．the place D．where
---- Can you think of a case in which the ecology of an area is in balance?
---- Sure. You see, ______ an environment is undisturbed, the ecology of the area is in balance.
A．unless B．as C．though D．where
_____ changed him was a mountain bike he received for his 15th birthday.
A.What B. Whether C. It D. That
The question _____ should do the work requires further discussion in the next meeting.
A. who B. that C. whom D. why
In 1969, _____ everyone had dreamed of happened the astronaut landed on the moon.
A. that B. what C. which D. as
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