硝酸银络合层析法中，和硝酸银形成π络合物，能力最强的是（）
A.
B.
C.
D.
E.
参考答案：D
-Can he get the first prize for running?
-Impossible now. He _______ so, but he has just hurt his leg.
A．would expect to do
B．was expected to do
C．has expected doing
D．is expected doing
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