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
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.
应该是指一种general idea吧 一种一直存在的道理
The usage of are (present tense) conveys that RIGHT NOW -- just a few days after prices rose this past Monday -- supplies ARE tight.登录 或 注册 后可以参加讨论