They lost their way in the forest, and     . Which of the following is wrong?

A．what made matters worse was that night began to fall

B．what was worse, it was getting dark

C．to make matters worse that night was falling

D．worse still, night had fallen

社团的各成员社应（）与借款人、担保人签订社团贷款合同。

A、分别

B、单独

C、共同

D、同时