Lizzie was ____ to see her friend off at the airport. [ ]

A. a little more than sad

B. more than a little sad

C. sad more than a little

D. a little more sad than

在不影响其紧后工作最早开始时间的前提下，本工作可利用的机动时间为( )。

A．总时差

B．最迟开始时间

C．自由时差

D．最迟完成时间