If you told the truth to your principal, he ______ able to give you much better suggestions than I can.
【正确答案】 D
【答案解析】虚拟语气。本句条件从句中的谓语动词用了过去式told，说明其内容与现在／将来的情况相反．所以主句谓语应该由“would+动词原形”构成。B、C不用于虚拟语气；A项were只用于表虚拟的条件从句中。