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_________ difficult the task may be, we must finish it on time, because we can’t meet such a precious opportunity _______ we have expected.

A. Whatever; that       B. However; as         

C. However; that        D. Whatever, which

_______ difficult the task may be, we must finish it on time, because we can’t miss _______ a precious opportunity．

A. Whatever; so　　　　　　　　　　　　　　　　　　　　　　　 B. However; such

C. However; so　　　　　　　　　　　　　　　　　　　　　　　 D. Whatever; such

 _______ difficult the task may be, we must finish it on time, because we can’t meet such a precious opportunity _______ we have expected.

A. Whatever; that                          B. However; as     

C. However; that                          D. Whatever; which

_________ difficult the task may be, we must finish it on time, because we can’t meet such a precious opportunity _______ we have expected.

_________ difficult the task may be, we must finish it on time, because we can’t meet such a precious opportunity _______ we have expected．

       A．Whatever; that        B．However; as

       C．However; that         D．Whatever, which