He can't have gone out,___the light is still on

问题描述:

He can't have gone out,___the light is still on
A.because
B.for

He can't have gone out,_B__the light is still on
A.because
B.for
because接从句的话前面不能有逗号
假如后面的of的话就可以用because
而for则可以