Do you have any difficulty _____ these flowers? I'd like to help you if you have any. [ ]

A. to plant

B. for planting

C. with planting

D. in planting

共和国时期罗马成文法的渊源有（）

A.民众大会制定的法律

B.元老院决议

C.长官告示

D.法学家解答

E.法典