—I promise that she       get a nice present on her birthday.

—It will be a big surprise to her.

A．should

B．must

C．would

D．shall

保守的按估算，由于检定周期过长产生的计量误差至少在（）以上.

A.±0.03%

B.±0.04%

C.±0.05%

D.±0.06%