单选题
The flower bud of a water lily opens at sunset since its opening is
triggered
by the decreased light.
A、
alleviated
B、
endured
C、
set off
D、
covered op
【正确答案】
C
【答案解析】
trigger引发，触发。set off使开始。alleviate使(苦痛等)减轻。endure耐久，忍耐。Cover up掩盖错误、非法地事物等。
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