Can we say ... when we celebrate?

[Galla]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #120 "Perfect Tenses", question 5

I honestly think that the time ......... come when we should celebrate our success.

(a) has
(b) had
(c) will
(d) having

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #120 "Perfect Tenses", answer 5

I honestly think that the time has come when we should celebrate our success.

Correct answer: (a) has
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I don't quite understand why there is "should celebrate" (in the second part of the sentence). Is it a conditional ? Can we say ..when we celebrate..?

Galla

[Alan]

Hi Galla,

Should here means ought to.

Alan
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English as a Second Language
You can read my ESL story Briefly

[Ronica0208]

Can't we use will here? I thought if we use has the answer could have been has come to and remove should