问题
选择题
. What a pity. Considering his ability and experience, he _________ better.
A．need have done
B．must have done
C．can have done
D．might have done
答案
D。
根据语法规则可知A和C不对，因为need和can用作情态动词时通常只用于否定句或疑问句，不用于肯定句；再根据句意，选D最佳。句意为：真是遗憾！考虑到他的能力和经验，他本来可以做得更好的。