(2010·江苏，31)—I have tried very hard to f
题型：选择题
问题：
(2010·江苏，31)—I have tried very hard to find a solution to the problem，but in vain.
—Why not consult with Frank？You see，________.
A．great minds think alike
B．two heads are better than one
C．a bird in the hand is worth two in the bush
D．it's better to think twice before doing something