填空题

【参考答案】

happened
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填空题
Mary has difficulty (swim) ______ because she is afraid of water.
单项选择题
A．Yes, it is.B．It’s red one.C．No, it isn’t.D．It’s very beautiful.
A．Yes, it is.
B．It’s red one.
C．No, it isn’t.
D．It’s very beautiful.
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