单项选择题

The repair work involved modifying two of the windows.

A．clearing
B．changing
C．mending
D．painting
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单项选择题
Compared with adults learning a foreign language, children learn their native language with ease.
A． Right
B． Wrong
C． Not mentioned
单项选择题
Adults’ knowledge and mental powers hinder their complete mastery of a foreign language.
A． Right
B． Wrong
C． Not mentioned
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