单项选择题

Whatever his former conduct ______, his circumstance should exempt him from rebuke now.

A．may have been
B．can be
C．had have been
D．could have been
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单项选择题
______ before we depart the day after tomorrow, we should have a wonderful party.
A．Were they to arrive
B．Would they arrive
C．Were they arriving
D．Had they arrived
单项选择题
The clerk reminded him to ______ a stamp to the envelope.
A．attach
B．affix
C．annex
D．fasten
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