Henry has come in his raincoat and gumboots ,_____for rain.
A:prepared
B:preparing
C:having prepared
D:prepares
请回答:
12345679×9=____
12345679×18=____
12345679×27=____
12345679×36=____
12345679×45=____
12345679×54=____
你发现了什么规律?