—How many times _______ you _______ to Beijing this year?
—Three times.
A：have；been
B：had；been
C：have；gone
D：had；gone
欧洲西部适宜牧草生长的有利条件足( )。
He was late as a result of the heavy snow.
——My parents and I will go to London for a trip tomorrow.
——Really ? __________.
下列是某同学进行过滤操作时的一些做法，其中错误的是（ ）
