人手上有19块内部小肌肉，它们分别是（）。

A.拇指处5块，小指基部3块，手指间骨骼肌7块，蚓状肌4块

B.拇指处4块，小指基部4块，手指间骨骼肌6块，蚓状肌5块

C.拇指处4块，小指基部3块，手指间骨骼肌8块，蚓状肌4块

D.拇指处4块，小指基部4块，手指间骨骼肌7块，蚓状肌4块

—What _____ you _____ at nine o'clock last night, Michael?

—I was watching TV.[ ]

A. was; doing

B. were; doing

C. is; doing

D. did; do