选择题:When the girl heard the news, she could do nothing

题目内容:
When the girl heard the news, she could do nothing but ______ back home. 
(A) :going
(B) :went
(C) :to go
(D) :go
参考答案:

烃类热裂解产生的裂解气在分离前需净化除去的杂质有( )。A、CH4、C2H4、C3H6、C4H6 B

烃类热裂解产生的裂解气在分离前需净化除去的杂质有( )。A、CH4、C2H4、C3H6、C4H6 B、 C2H2、H2S、CO2、H2O C、 C2H6、C3H

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