假设两个带符号的整数相减，下列叙述中正确的是______。

A) 两个异符号的整数相减，若结果的符号位与被减数的符号位相反，则一定溢出
B) 两个异符号的整数相减，若结果的符号位与被减数的符号位相同，则一定溢出
C) 两个异符号的整数相减，若符号位有进位，则一定溢出
D) 两个异符号的整数相减，若符号位无进位，则一定溢出

Tom said he did not mind what time I arrived at his place____I promised to go and help him.

A．on condition that

B．so far

C．as well as

D．as good as