With his poor English, he even cannot get his ideas across, ______ exert any essential effect on others.
A. [A] let alone
B. [B] that's to say
C. [C] not to speak
D. [D] not to say
最后贯入度是指打桩时最后______击桩的平均入土深度。( )
A. 5
B. 10
C. 15
D. 20
一个网络计划( )
A. 有时可有多条关键线路
B. 只有一条关键线路
C. 有时没有关键线路
D. 关键线路是不可改变的
______ all our goodwill to see her through the hard time, Sarah declined politely.
A. [A] On
B. [B] At
C. [C] In
D. [D] For