meaning of 'Appreciate'

[Litta]

English Language Tests, Intermediate level

ESL/EFL Test #209 "What Comes Next? (3)", question 6

If you could be serious for just one moment ..........

(a) I'd accept it
(b) I'd believe it
(c) I'd appreciate it
(d) I'd understand it

English Language Tests, Intermediate level

ESL/EFL Test #209 "What Comes Next? (3)", answer 6

If you could be serious for just one moment I'd appreciate it.

Correct answer: (c) I'd appreciate it
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answer and explanation?

Litta

[Mister Micawber]

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The answer is above your question. 'Appreciate' means 'be grateful for'. 'Please' is a useful word.
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Native English teacher at Mister Micawber's