问题
选择题
.He has just arrived, but he talks as if he _____ all about that.
A．know
B．knows
C．known
D．knew
答案
D
as if表示不可能发生的事情时用虚拟语气。
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.He has just arrived, but he talks as if he _____ all about that.
A．know
B．knows
C．known
D．knew
D
as if表示不可能发生的事情时用虚拟语气。
④各种生产要素在生产中各自发挥着相互不可代替的作用