(10)Helium is not flammable and ,next to hydrogen ,is......
(a)known the lightest gas
(b)lightest the known gas
(c)the lightest gas known
(d)the known gas lightest
Ans : (C)
請問各位大大為什麼是(C)呢 ? 又(A)是不是少了一個 "as"在"known"的後面??

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