Will you buy an electronic car when they.available?A.become.B,became.C.are becoming .D,will become请帮我选正确答案并找出原因.

问题描述:

Will you buy an electronic car when they.available?
A.become.B,became.C.are becoming .D,will become
请帮我选正确答案并找出原因.

选A 主句将来时 主将重现.所以从句用一般现在时态 一般看到if when等词都是主将重现