meaning of "taken aback"

[Dieaa]

English Idioms and Expressions, Elementary Level

ESL/EFL Test #7 "All Agog", question 6

When she told her parents that she had decided to get married, they were utterly taken aback.

(a) surprised
(b) returned
(c) overturned
(d) determined

English Idioms and Expressions, Elementary Level

ESL/EFL Test #7 "All Agog", answer 6

When she told her parents that she had decided to get married, they were utterly surprised.

Correct answer: (a) surprised
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what mean of taken aback?

Dieaa

[Mister Micawber]

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Native English teacher at Mister Micawber's