If you have really been studying English for so long, it's about time you ______ able to write letters in English.
A、
should be
B、
were
C、
must be
D、
are
【正确答案】
B
【答案解析】
it is(about)time(that)是一个虚拟语气句型，所跟从句的谓语动词用一般过去式，故B项were为答案。
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