若某共价化合物分子中只含有C、N、H三种元素，且以n(C)、n(N)分别表示C、N的原子数目，则H原子数目最多等于 [ ]

A. 2n(C)+2+n(N)

B. 2n(C)+2+2n(N)

C. 2n(C)+2

D. 2n(C)+1+2n(N)

I don't know if she     to my birthday party tomorrow. If she    , I'll be very happy.

A. comes; comes       B. will come; comes      C. comes; will come