填空题


【参考答案】

when改为that，
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填空题
staggered改为staggering。
单项选择题
A．On foot and by boat.B．By car and on foot.C．By air and by car.D．By air and by bus.
A．On foot and by boat.
B．By car and on foot.
C．By air and by car.
D．By air and by bus.
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