Question

The process of producing electricity may also give out CO2, ______ you heat your house with electricity instead of charcoal.

A．as long as

B．as soon as

C．as if

D．even if

Answer 1

D

考查短语辨析。句意为：产生电的过程也会发出二氧化碳，即使你用电而不是用木炭加热你的屋子。故答案为D。