—How long ago _________ you _________ the English Club?—I _________ it since two years ago.
A:did, join; joined
B:have, been in; joined
C:have, joined; have joined
D:did, join; have been in
【环境保护】阅读材料,完成下列问题。
下图示意某段高速公路沿线土壤重金属含量空间分布及风向频率,读图完成下列问题。
7+54=____
56+47=____
73+8=____
24+60=____
4+27=____