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4. The conference ________ a full week by the time it ends.

  A) must have lasted                 B) would have lasted

  C) will have lasted                  D) has lasted

48.The conference ________ a full week by the time it ends.

The conference ________ a full week by the time it ends.

A. must have lasted　　　　　　　　　　　　　　　　   B. will have lasted

C. would last　　　　　　　　　　　　　　　　　　 D. has lasted

A. must have lasted　　　　　　　　　　　　　　　　   B. will have lasted

C. would last　　　　　　　　　　　　　　　　　　 D. has lasted

The conference ________ a full week by the time it ends.

[　　]

The conference ________ a full week by the time it ends.

[　　]