单项选择题

The professor required that all the essays ______ ready by next Monday.

A．to be
B．be
C．being
D．are
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单项选择题
The increase in international trade has lead to the demand for employees with the ability to communicate in a foreign language.
A．国际贸易的增加要求员工具备使用外语交际的能力。
B．国际贸易增加了对员工使用外语交际能力的要求。
C．国际贸易的增加需要具备外语交际能力的员工。
D．国际贸易增加了员工使用外语的要求，也提高了他们的外语能力。
单项选择题
They hardly believed that the troop ______ the river that night, and surrounded their city.
A．to cross
B．had crossed
C．crossing
D．cross
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