Many difficulties have         as a result of the change over to a new type of fuel.
A．risenB．raisedC．a(chǎn)risenD．a(chǎn)rrived
C
risen上升，不及物動(dòng)詞，raised舉起，升起，及物動(dòng)詞，arisen產(chǎn)生，出現(xiàn)，arrived到達(dá)，句意：由于一種新燃料改變的結(jié)果，許多困難出現(xiàn)了。故選C。
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