19. Look ！ There is a whole crowd of people over there. Go and see what   and if it is a bargain,buy it.

A. is selling       B. has been selling

C. is being sold    D. has been sold

19.   C考査動詞時態(tài)和語態(tài)。句意：看！那邊有一群人，去看看在賣什么，如果便宜就買。根據(jù)句意可知，表示"說話的時候正在賣什么"，用現(xiàn)在進行時，而且what和sell是被動關(guān)系，用現(xiàn)在進行時的被動語態(tài)，所以選C。

題目來源：2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練15 動詞的時（語）態(tài)和主謂一致

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