As is known,we know some basic knowledge concerning AIDS,we can protectourselves from being infected.A.as far as\x05\x05\x05\x05B.if only \x05\x05\x05\x05C.so long as\x05\x05\x05D.unless

As is known,we know some basic knowledge concerning AIDS,we can protect
ourselves from being infected.
A.as far as\x05\x05\x05\x05B.if only \x05\x05\x05\x05C.so long as\x05\x05\x05D.unless

As is known,C we know some basic knowledge concerning AIDS,we -- -- .
SO LONG AS :只要 - - - 用于条件状语从句

周所周知，我们知道关于AIDS（艾滋）的一些基础知识，我们可以保护我们自己不被传染。