在以下各网络类型中,()的可靠性最高。
A、树形
B、网孔形
C、环形
D、星形
参考答案:B
Choose. What do you do at home? 选一选,把相应的字母序号填入括号内。
A
BC
( ) 1. I put away my toys.
( ) 2. I clean my bedroom.
( ) 3. I make my bed.
No sooner had he arrived than he _____ to complain about the terrible weather. [ ]
A. began
B. would begin
C. had begun
D. begins