问题
选择题
I knew the lady________Bill when she spoke of a bright young boy. [ ]
A．referred to
B．was referring to
C．pointed at
D．was pointing at
答案
答案：B
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I knew the lady________Bill when she spoke of a bright young boy. [ ]
A．referred to
B．was referring to
C．pointed at
D．was pointing at
答案：B
sinl00πt（V），则下列说法中正确的是（ ）
V