单项选择题

All of the international delegates attending the conference ______ to bring a souvenir from their own countries.

A．has asked
B．is asking
C．were asked
D．was asking
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单项选择题
Many of the fads of the 1970s ______ as today' s latest fashions.
A．are being revived
B．is revised
C．are revoked
D．is being reviled
单项选择题
Plastic bags are useful for holding many kinds of food, ______ their cleanness, toughness and low cost.
A．by virtue of
B．in addition to
C．for the sake of
D．as opposed to
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