A.dim str as string B.dim str as string(256) C.dim str as string[256] D.dim str as string*256
A.if 50≤X≤200then y=1000 B.if x<=200andx>=50then y=1000 C.if x<=200orx>=50then y=1000 D.if x>=50,x<=200then y=1000
A.9 B.11 C.1 D.3