18、According to recent exploration to Mars, it may hold ______ water as previously thought．

A．twice as much             B．a(chǎn)s much twice             C．twice much as        D．much as twice

18、A

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According to recent exploration to Mars, it may hold ______ water as previously thought．

A．twice as much             B．a(chǎn)s much twice             C．twice much as        D．much as twice

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