单项选择题

______ explain it to him, he still didn't understand.

A．Hard as I tried to
B．As I tried hard to
C．Hard I tried to
D．Tried as I hard to
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单项选择题
The committee ______ the problem for a whole afternoon but they have not yet reached an agreement.
A．has discussed
B．has been discussing
C．are discussing
D．have been discussing
单项选择题
The twins are so much ______ that it is difficult to tell one from the other.
A．similar
B．equal
C．like
D．alike
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