Half of the class most of the work. Some of the work really difficult. A.have done; is B.ha——青夏教育精英家教网—

摘要：Half of the class most of the work. Some of the work really difficult. A.have done; is B.has done; are C.has done; is D.have done; are

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Half of the class most of the work. Some of the work really difficult.

A.have done; is B.has done; are C.has done; is D.have done; are

Half of the class__________ most of the work. Some of the work ________really difficult.

A. have done ; is B. has done ;are

C. has done ; is D. have done ; are

Half of the class ________ most of the work．Some of the work ________ really difficult．

A．have done, is

B．has done, are

C．has done, is

D．have done, are

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