下列程序执行的结果为( )。
A = "HELLOCANIHELPYOU"
B = "WANGCHANGLI"
C = Left(A,5) +"!"
D = Right(A, 7)
E = Mid(A, 6, 4)
F = Mid(B, Len(B) -6) + "!"
G = E+ " " + D + " ! "
H = C +" " + F
Print H + " " + G

A．HELLO! CHANGLI! CANIHELPYOU!

B．HELLO! WANG! CANIHELPYOU

C．HELLO! CANIHELPYOUI

D．HELLO! CHANG! CANIHELPYOU!

试述口罩使用的注意点？