单项选择题

They were (used to) (hear) him (singing) in a cheerful voice in the classroom when he thought (no one) was near.

A．used to
B．hear
C．singing
D．no one
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(In my opinion) the girl is (enough beautiful) (to be) a movie star (as great as) Audrey Hepburn.
A．In my opinion
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The conversation had been (carried on) chiefly (in French), a language (which) Jerry was (perfectly) acquainted.
A．carried on
B．in French
C．which
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