单项选择题

It is an irrevocable letter of credit which can not （）

A．change
B．be changed
C．changing
D．changed

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单项选择题

If you have any comment about these clauses, do not hesitate （）

A．make
B．making
C．being made
D．to make

单项选择题

（）is a major port of Turkey.

A．Karachi
B．Haikou
C．Istanbul
D．Muscat

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