【題目】With a lot of difficult problems ________, the manager felt worried all the time.
A.settled
B.to be settled
C.settling
D.to settle

【答案】D
【解析】句意：有很多難題要解決，經(jīng)理一直感到擔(dān)心。經(jīng)理一直憂心忡忡，是由于有很多困難要解決，因此用不定式表示要解決；又因句中解決困難的人是經(jīng)理，因此要用主動形式。故選D。

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