下列实验结论正确的是                            

A．向某无色溶液中滴加酚酞试液无现象，则溶液一定呈中性

B．向某固体中滴加稀盐酸，有气泡产生，该固体一定是碳酸盐

C．12mL蒸馏水和20mL酒精混合后，体积小于32mL，说明分子之间有间隙

D．将洗涤剂滴加到少量植物油和水的混合物中，振荡、静置，不分层，说明植物油可溶于水

一I heard that you got an A in the chemistry exam．Well done!

一Thanks，I know that you     a good job as well．

A．shouId have done

B．need have done

C．must have done

D．could have done