I ______ tell you with certainty that he won't be able to finish it before the deadline.
A:will
B:must
C:can
D:may
下列有关细胞凋亡的叙述中,正确的是( )
解:∵EF∥AD
∴∠2= ∠ ____(____)
又∵∠1=∠2
∴∠1=∠3(____)
∴AB∥____(____)
∴∠BAC+ ∠____=180°(____)
又∵∠BAC=75°
∴∠AGD=____.