[求助]cd上没讨论过的题GWD28-Q10

 GWD28-Q10:

In an attempt to attract more tourists, the Swiss government commissioned several life-size fiberglass cow statues, having them decorated by local artists, and set them up on the streets of Zurich.

A.      the Swiss government commissioned several life-size fiberglass cow statues, having them decorated by local artists, and

B.       the Swiss government commissioned several life-size fiberglass cow statues, they were decorated by local artists, and then

C.      the Swiss government commissioned several life-size fiberglass cow statues, had them decorated by local artists, and

D.      several life-size fiberglass cow statues were commissioned by the Swiss government, decorated by local artists, and then

E.       several life-size fiberglass cow statues, commissioned by the Swiss government, were decorated by local artists, and they    答案：C

C选项的had是怎么回事啊，看着像错的

请nn们指教