— I can't recite the poem.

— Well, you are supposed _____ it many times yesterday evening. [ ]

A. to read

B. reading

C. to have read

D. having read

下列桡足类中（）仅出现在池塘中，为池塘的特有种。

A.大眼剑水蚤

B.歪水蚤

C.小星猛水蚤

D.多毛镖水蚤