A.hadbeenworking
B.haveworked
C.havebeenworking
D.worked
A.were
B.are
C.was
D.is
A.must
B.can
C.may
D.will
A.路面中线标高
B.路面边缘标高
C.路缘带外侧边缘标高
D.中央分隔带外侧边缘标高
A./...a...the
B.the.../...the
C.the...the...the
D./.../.../
A.was
B.be
C.is
D.are