单项选择题

Ethanol is commonly used as a gasoline supplement, but it is currently about（）methanol.

A.twice as expensive as
B.twice as more expensive as
C.as twice more expensive as
D.as twice expensive as

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单项选择题

A.three times as big as
B.three times as bigger as
C.as three times big as
D.as three times gigger as

单项选择题

A.in time of
B.in case of
C.in terms of
D.in honour of

单项选择题

A.substantial
B.substance
C.submit
D.subjective