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题库 / OG2017V-SC-199
Coffee prices rose sharply Monday, posting their biggest one-day gain in almost three years, after a weekend cold snap in Brazil raised concern that there could be damage to the world's largest crop when at a time with supplies already tight.
that there could be damage to the world's largest crop when at a time with supplies
that the world's largest crop could be damaged at a time such as when supplies are
that the world's largest crop could be damaged at a time when supplies are
of the world's largest crop possibly being damaged at a time with supplies
of possibly damaging the world's largest crop at a time that supplies were
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This sentence describes concern about a potential problem, which is
appropriately expressed in subjunctive mood (could be damaged).
C. Correct. This sentence correctly uses the subjunctive mood to express a //potential problem//, and the idiom// at a time when// is correct.
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