(2010·天津卷) As a new graduate, he doesn’t know it takes to start a business here.
A. how B. what C. when D. which
. (2010·江西名校模拟) —I’ve heard they went skiing in the mountains last winter.
—It ______ true because there was so little snow there then.
A. may not be B. won’t be C. couldn’t be D. mustn’t be
（2010·云南模拟）The tomato juice left brown ____ on the front of my jacket．
A．spots B．points C．tracks D．traces
（2010·云南模拟）Most of the professors _____ to our school were from South Africa．
A．invited B．to be invited C．being invited D．had been invited
（2010·重庆模拟）—Alice, you look puzzled．Haven’t you understood it?
—Yes．I _____of another problem just now．
A．had thought B．have thought C．thought D．was thinking
