单项选择题

Laura opened the envelope, (fold) ______ the letter and began to read it carefully.
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单项选择题
The workforce have recently been calling for their working hours to be reduced. Many companies have (according) ______ switched to a five-day work.
The workforce have recently been calling for their working hours to be reduced. Many companies have (according) ______ switched to a five-day work.
单项选择题
I ______ you that Mary's back yesterday but I forgot all about it.
A．should have told
B．ought to tell
C．had to tell
D．should tell
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