A:to read
B:to be read
C:reading
D:being read
如图所示,四边形ABCD中,∠B=90°,AB=2,CD=8,AC⊥CD,若sin∠ACB=13,则cos∠ADC=____.
have fun; dress up; play tricks on; gain; admired… for; in memory of; look forward to; look as though/if; take place; starve to death