The class could not keep a straight face...
In the following question, four alternatives are given for the idiom/phrase in bold and italics in the sentence. Choose the alternative which best expresses the meaning of idiom/phrase.
The class could not keep a straight face on hearing the strange pronunciation of the new teacher.
remain silent
remain serious
remain mute
remain disturbed
Correct answer is B
No explanation has been provided for this answer.
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