—________is it ________ had made our headteacher that angry?

— Six of us being late this morning.

A．What; what

B．That; that

C．What; that

D．What; which

制定交易计划的好处有( )。

A．使交易者被迫考虑可能被遗漏的问题

B．使交易者明确将要何时改变交易计划，以应付多变的市场环境

C．使交易者明确自己正处于何种市场环境

D．使交易者选取适合自身特点的交易方法