单选题
It is high time that such a practice ______ an end to.
A、
is put
B、
be put
C、
was put
D、
must be put
【正确答案】
C
【答案解析】
It's (high) time that．．．后的定语从句需用虚拟语气，从句中谓语动词用一般过去时。
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