1、A.can 其他都说不通 can在这里表示可以、能够
2、A
by all means:by all means意思是“一定”、“无论如何”、“用一切手段”;by all means亦可用于回答,表示有礼貌的同意,作“好的”、“当然可以”解.
你们一定要设法把他带到这里来.
You must bring him here by all means.
这个规划必须要实现.
This project must be realized by all means.
你务必在他去新加坡之前提醒他.
You should by all means warn him before he leaves for Singapore.
我可以拿一个吗?——当然可以.
May I have one?—Yes,by all means.
B意为不用谢 C改为Yes,you can D意为恐怕是这样的