某天上午的温度是5°C，中午又上升了3°C，下午由于冷空气南下，到夜间又下降了9°C，则这天夜间的温度是________°C
-1
--Jack had prepared for the game for such a long time. We all thought he ________ it.
-- What a pity! He ________ too nervous when playing it.
A．would have won；had been
B．could have won；must be
C．could have won；was
D．would have won；has been
砌筑砂浆材料质量要求中，当在使用中对水泥质量有怀疑或水泥出厂超过（）月（快硬硅酸盐水泥超过1个月）时，应复查试验，并按其结果使用。
A.2个
B.3个
C.4个
D.6个
