单项选择题

In my country, the ______ are all distributed free.

A．letters box
B．letters boxes
C．letter’s box
D．letter boxes
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单项选择题
The reporters exposed the corruption of several senior officers in the government; consequently, these officers ______ to resign from office.
A．have asked
B．were asked
C．had asked
D．had been asked
单项选择题
The earnings of women are well below that of men ______ educational differences that are diminishing between the two sexes.
A．although
B．though
C．despite of
D．in spite of
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