单项选择题

In case he () before I get back, please ask him to wait.

A. would arrive
B. should arrive
C. arrives
D. arrived

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单项选择题

Those instruments, such as the microscope and the telescope, which are essentially aids to the eye, have certain features ().

A. in common
B. by common
C. under common
D. among common

单项选择题

Apart from these sciences there is philosophy, about () we will talk in detail later.

A. that
B. it
C. what
D. which

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