问题补充:
The book well. I’m afraid it out.
A. is sold; has sold
B. sells; is sold
C. sells; to be sold
D. is sold; sells
答案:
A. is sold; has sold
(答案→)B. sells; is sold
C. sells; to be sold
D. is sold; sells
解析:句意:这本书卖得不错。我担心它已经卖完了。Sell可用作及物动词和不及物动词。其主语一般是指人,但是在表示某物卖得不错时,要用主动语态。结合语境可知下文主语是出售的对象,故用被动语态。上文表示某物卖得不错,故选D。