2，3，6，10，17，( )
A．20．
B．22
C．25
D．28
参考答案：D
解析： 和数列变式。前两项之和再加1得到第三项。
--- What do the police think about the murder?
--- I’m not sure. But I want anyone who ______ the clue to contact the police actively.
A．have
B．has
C．to have
D．are having
Once a decision has been made，all of us should ________ it.
A．direct to
B．stick to
C．lead to
D．refer to
