First, this doesn't look like a GMAT-quality question, but here goes my explanation anyway.
Quote:
Originally posted by Yazynin
No sooner did the commissioner order the imposition of curfew in the city, when intense riots broke out near the bus station.
(A) curfew in the city, when
(B) the curfew in the city, when
(C) curfew in the city, than
(D) the curfew in the city, than
(E) curfew in the city, then
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First, memorize the pattern:
no sooner + inversion +
than + sentence
Second, "curfew" is a singular
count noun and therefore requires a
determiner.
HTH