

câu 49 .You must do it now,or never
A if you don't do it now,you''ll never do it
B Do it now ,and then never again
C you''ll never do it again if you do it now
D If you don't do it now you can do it later
A if you don't do it now,you''ll never do it
B Do it now ,and then never again
C you''ll never do it again if you do it now
D If you don't do it now you can do it later