The vegetables in his field well because they are pollution­free.A. are sellingB. h

问题补充：

The vegetables in his field well, because they are pollution­free.

A. are selling

B. have been sold

C. are sold

D. sell

答案：

A. are selling

B. have been sold

C. are sold

(答案→)D. sell

解析：D 考察动词的时态语态。句义：他田里的蔬菜销售得很好，因为它们是无污染的。某些课用来表示主语内在品质或者性能的动词，如sell ,wash, feel, read等，其主语通常都是物，承受动作课用主动形式表示被动含义，且不用进行时。故D正确。