[请益] 这句要用单数还是复数

楼主: iplfl (living for love)   2018-07-28 00:40:17
(1)
Whether and how this therapy halts disease progression remain unclear.
还是
(2)
Whether and how this therapy halts disease progression remains unclear.
谢谢
作者: anna615566 (我妈叫我去睡觉)   2018-07-28 02:21:00
2
作者: robert0608 (跳跳)   2018-07-28 10:21:00
2

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