—Yes, I've returned it ______.
A:already; already
B:yet; yet
C:already; yet
D:yet; already
炎炎夏日,甲安装队为A小区安装66台空调,乙安装队为B小区安装60台空调,两队同时开工且恰好同时完工,甲队比乙队每天多安装2台.设乙队每天安装x台,根据题意,下面所列方程中正确的是( )
如图所示舞蹈属于哪个国家( )