There is __"u" and __ "m" in the word "umbrella".

There is __"u" and __ "m" in the word "umbrella".
There is __"u" and __ "m" in the word "umbrella".

There is __"u" and __ "m" in the word "umbrella".
a u
an m

a an

1.a
2.an

an +A,e,f,h,i,l,m,n,o,s,x
a +B,c,d,g,j,k,p,q,r,t,u,v,w,y,z
所以这个题是a 和an