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  3. Anne couldn’t concentrate ______ what she was doing while her family were watching TV.

Anne couldn’t concentrate ______ what she was doing while her family were watching TV.

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问题 Anne couldn’t concentrate ______ what she was doing while her family were watching TV.
选项 A、to
B、on
C、for
D、in
答案B
解析 本题考查动词与介词的固定搭配。concentrate on构成固定搭配，意为“集中注意力于，全神贯注于”，因此，选项B正确。
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