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The bell rang ___________ I had time to look over my examination paper.
A. until
B. when
C. as
D. before
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接上题，下列代码实现对闹铃音的控制： assign alarm_time=stop_bell？（time_equ （（（Second[0]==1'b1) clk_500) || （（Second[0]==1'b0) clk_1k))):1'b0; 这个表述可以改写为（）。A.if (stop_bell==1'b1) begin case(Second[0]) 1'b1:alarm_time=clk_500; 1'b0:alarm_time=clk_1k; default:alarm_time=1'b0; endcase end else alarm_time=1'b0;#B.if (stop_bell) if(!time_equ) begin case(Second[0]) 1'b1:alarm_time=clk_500; 1'b0:alarm_time=clk_1k; default:alarm_time=1'b0; endcase end else alarm_time=1'b0; else alarm_time=1'b0;#C.if (stop_bell==1'b1) if(time_equ) begin case(Second[0]) 1'b1:alarm_time=clk_500; 1'b0:alarm_time
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