[考題] 一題被動式.
考題:一般
題目:
There are over 270,000,000 telephones _______ throughout the world.
(A) install
(B) installing
(C) installed
(D) have been installed
答案是C
提問:
答案是C沒錯.但D為何不行.? 表被動完成式.
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