单项选择题

To obtain a satisfactory result, one must apply two ______ of paint on a dean surface.

A. coats
B. levels
C. times
D. courses
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单项选择题
The treasury issued an order stating that ______ land purchased from the government had to be paid for in gold or silver.
A. henceforth
B. moreover
C. whereby
D. however
单项选择题
Even ff his famous father ______ in person tomorrow, it ______ too late to do anything.
A. will arrive...is
B. should arrive... were
C. arrives... will be
D. arrives... would be
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