how long ago ( )his diet?1 will he begin 2 has he begun 3 was he begunning 4 did he begin
问题描述：
how long ago ( )his diet?1 will he begin 2 has he begun 3 was he begunning 4 did he begin
请问,选择哪个,然后分别说出为什么对和错
答
D
选择用过去式,看到AGO基本就是过去式了,这里有3,和4,3是过去进行式,显然是不对的,因为不是一个正在进行的动作,所以选择4.
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