She said that she would invite me to dinner, but I wonder if she was kidding or______.
A．in all
B．in advance
C．in earnest
D．in depth

A.
A．in
B.in
C.in
D.in

【参考答案】

C
该句意为：她说要请我吃饭，但我拿不准她是开玩笑还是认真的。inall：总计；inadvance：事先；ine......

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