The new colleague () to have worked in several big corporations before he joined our company.

单项选择题Mr. Brown's condition looks very serious and it is doubtful if he will ().

A．pull back
B．pull up
C．pull through
D．pull out

单项选择题You must let me have the annual report without () by ten o' clock tomorrow morning.

A．failure
B．hesitation
C．trouble
D．fail