D因为这里的假设不可能成为现实,所以就要用虚拟语气.且在这类虚拟语气中,时态应比原来的时态再前进一格,如此句中,它如果不用虚拟语气的话,是以前发明就应当是用一般过去时态,而使用虚拟语气后时态前进一格就要用过去完成时.
虚拟语气6.Much labour would have been saved if the electronic co
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