As is reported, it will be more than 20 years ________ humans are able to walk on Mars.

A．before B．when C．since D．a(chǎn)fter

 

A

【解析】

試題分析: 句意：據(jù)報(bào)道，還要20年的時(shí)間人類才能夠在火星上行走。A在之前；B當(dāng)…..時(shí)候；C自從；D在之后。固定句型：It will be +時(shí)間段+before“還要多久才”，選A。

考點(diǎn)：考查連詞辨析

 

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