—He should have come to join in the thorough cleaning.

—He ________, I think. It's not his turn.

A．needn't have to

B．needn't have

C．didn't have to

D．doesn't need to

我国资源的基本国情是[ ]

A．取之不竭，用之不尽

B．总量丰富，但人均不足

C．总量很少，大部分依赖进口

D．人均资源丰富，但种类很少