关于时间状语和时态的问题2小题,
关于时间状语和时态的问题2小题,
·During the period of recent terrorist activities ,people ____not to touch any unattended bag.
A.had always been warned
B.were always being warned
C.are always warning
D.always warned
·Over the past decades,sea ice ___in the Arctic as a result of global warning.
A.had decreased
B.decreased
C.has been decreasing
D.is decreasing