All these gifts must be mailed immediate

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问题选择题

All these gifts must be mailed immediately in time for Christmas. [ ]

A.in order to have received

B.in order to receive

C.so as to be received

D.so as to be receiving

答案

答案：C

选择题

The two presidents agree with each other on the whole, but much remains______at the following meeting.

A．discussing

B．discussed

C．to discuss

D．to be discussed

单项选择题

管路系统的特性曲线是随着（）的增加而上升。

A、流量

B、扬程

C、轴功率

D、效率