---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

从法国大革命时期（）率先聘用私人秘书后，“私人秘书”逐渐成为风靡环球之走俏职业。