The trouble with such resources as coal, oil and gas ______ that they are not renewable.
A．was B．a(chǎn)reC．have beenD．is
D

試題分析：句意：象煤，油和氣這樣的資源問題是它們不是可再生的。這句話是客觀事實，所以用一般現(xiàn)在時，又因為主語是the trouble所以謂語用單數(shù)，所以選D。
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