'in order to' + infinitive

[amodash]

Test No. incompl/advan-15 "Advertising", question 2

The local department store has to make a sustained effort at this time of the year to ......... customer demand for summer clothing.

(a) satisfy
(b) satisfaction
(c) satisfies
(d) satisfying

Test No. incompl/advan-15 "Advertising", answer 2

The local department store has to make a sustained effort at this time of the year to satisfy customer demand for summer clothing.

Correct answer: (a) satisfy
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why satisfy why not satisfying?

[Alan]

Hi Amodash,

You need the infiniitve in this construction: (in order) to satisfy.
Alan
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English as a Second Language
You can read my ESL story The Name of the Game