单项选择题

______ you ______ further problems with your printer, contact your dealer for advice.

A. If, had
B. Have, had
C. Should, have
D. In case, had
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单项选择题
______ conscious of my moral obligations as a citizen.
A. I was and always will be
B. I have to be and always will be
C. I had been and always will be
D. I have been and always will be
单项选择题
That was not the first time he ______ us. I think it's high time we ______ strong actions against him.
A. betrayed...take
B. had betrayed...took
C. has betrayed...took
D. has betrayed...take
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