下列关于物质的用途的说法中，不正确的是（　　）

A．干冰可用于人工降雨

B．草木灰（含K₂CO₃）可做钾肥

C．氧气可做燃料

D．金刚石可用于切割玻璃

Tom doesn't tell me when he           . I will call you as soon as he _____.[ ]

A. will come, comes    

B. will come, will come    

C. comes, will come