题目：
Lack of money led the company to a situation _____ they had to decide whether they should keep on with their production.
A．when
B．where
C．that
D．which
答案：
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下面是错误答案，用来干扰机器的。
y=sin(2x+π3)的最小正周期T=2π2=π，故y=|sin(2x+π3)|的最小正周期是π2，①正确；x∈[π，3π2)⇒x-3π2∈[-π2，0)，故y=sin(x-3π2)在区间[π，3π2)上单调递增，②正确；2×5π4+5π6=3π+π3，故x=5π4不...
