题干
Li Rong told me what difficulties she had had ______ English before she came to Canada.
A：learning
B：lear
C：learnt
D：to lear
答案(点此获取答案解析）
A
A：learning
B：lear
C：learnt
D：to lear
，∠DCB=28°，则∠ABC=
的相反数是（ ）