单项选择题

During his four years in Japan, he took great______ to learn to distinguish .fake pearls from genuine pearls.

A．pains
B．actions
C．steps
D．efforts
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单项选择题
When I took his temperature, I found it was two degrees above______.
A．average
B．ordinary
C．regular
D．normal
单项选择题
A year has______ and there is no sign of situation getting any better.
A．emerged
B．enclosed
C．elapsed
D．expended
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