Among the following, the correct statement(s) is(are)

A

$$Al(CH_{3})_{3}$$ has the three-centre two-electron bonds in its dimeric structure

B

$$BH_{3}$$ has the three-centre two-electron bonds in its dimeric structure

C

$$AlCl_{3}$$ has the three-centre two-electron bonds in its dimeric structure

D

The Lewis acidity of $$BCl_{3}$$ is greater than that of $$AlCl_{3}$$