— You________have finished your composition.

— I had meant to, but before I could, the bell rang and we had to hand in our test papers . [ ]

A. were supposed to  

B. were able to

C. had to  

D. were determined to

下列计量单位中不属于国际单位制的是（）。

A.K

B.mol

C.kg

D.mmHg