题干
Word came _____ his poem won the first prize.
A：that
B：whether
C：a
D：because
答案(点此获取答案解析）
A
A：that
B：whether
C：a
D：because
沿弦AC翻折交AB于点D，连接CD．如果∠BAC=20°，则∠BDC=（ ）