单项选择题

All the light in the house are ______ in the draught from the opening window.

A．floating
B．fluttering
C．wavering
D．flickering
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单项选择题
Six months ago the World Health Organization recommended that cigarette smoking and the use of plywood and particle board ______ in enclosed areas.
A．be restricted
B．should restrict
C．will be restricted
D．must be restricted
单项选择题
______ my sister's help we would not have finished the work.
A．If only
B．Except for
C．Now that
D．But for
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