A．( Going shopping is much more exhaustive than shopping on the Internet

B．( For me, taking a rest is better than surging the Internet or shopping

C．( I am not sure if I should take a break to work in the garden

D．( My friend and I have to finish our annual report by this weekend

施工合同条件的主要特点表现为（）。

A．以项目经理为核心

B．以竞争性招标选择承包商

C．以“交钥匙”为合同条件

D．其核心是专用条件