【B20】
A. late
B. back
C. ready
D. about
某工程双代号时标网络计划下图所示，其中工作A的总时差和自由时差()天。
A. 分别为1和0
B. 均为1
C. 分别为2和0
D. 均为0
Which of the following is not the reason why companies have begun to shift their attention
A. the constant improvement of economy in the US.
B. the demand of experienced and well-trained employees.
C. the demonstration of its market strength indicator.
D. the possible lack of workforce in the near future.
Which of the following cannot be led by an effective comprehensive immigration reform？
A. the protection of opportunities for legal immigrants in the US.
B. security problems such as criminals and national security threats.
C. new biometric cards to replace older ones to ensure security.
D. the return of public confidence in immigration policies.
微信支付 
支付宝支付