单项选择题

3（）

A．in
B．upon
C．by
D．with

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单项选择题

The woman should have arrived by（）

A．10:45.
B．10:40.
C．10:55.
D．11:00.

单项选择题

International efforts against Serbia have been ineffective because（）

A．ships carrying illegal supplies still sail along the river.
B．more illegal goods have been carried over land.
C．local authorities didn’t attempt to stop illegal goods.
D．there has been disagreement over economic sanctions.