要在当前工作表（Sheet1）的B5单元格中引用另一个工作表（如Sheet4）中B2:B7单元格的和，则在当前工作表的B5单元格中输入的表达式应为__________。

A、=SUM(Sheet4!A2:A7)

B、=SUM(A2:Sheet4!A7)

C、=SUM((Sheet4)A2:A7)

D、=SUM((Sheet4)A2:(Sheet4)A7)

E、=SUM((Sheet1)A2:(Sheet1)A7)

F、=SUM(Sheet1!A2:A7)

A.Sheet2#A1

B.Sheet2$A1

C.Sheet2&A1

D.Sheet2!A1

A.√

B.×

A.=F6

B.=Sheet3!F6

C.=F6!Sheet3

D.=Sheet3F6

A.=Sheet8!D8

B.=D8（Sheet8）

C.+Sheet8!D8

D.$Sheet8>；$D8

A.Sheet2：A4

B.A4：Sheet2

C.Sheet21A4

D.A41Sheet2

  A．[book1.xls]!a2  B．sheet1!$A$2

  C．[book1.xls]sheet1!$A$2  D．sheet1!A2

  A．[book1.xls]!a2  B．sheet1!$A$2

  C．[book1.xls]sheet1!$A$2  D．sheet1!A2

A.Sheet1!A2

B.Book2!Sheet1（A2）

C.BookSheet1A2

D.[Book2]sheet1!A2