摘要： In 1948, three American scientists invented transistor, which is small electronic device to control an electric current. A. the; a B. a; a C. the; the D. a; the

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In 1948, three American scientists invented ____ transistor, which is ____ small electronic device to control an electric current.

A．the; a

B．a; a

C．the; the

D．a; the

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In 1948, three American scientists invented ____ transistor, which is ____ small electronic device to control an electric current.

A．the; a B．a; a C．the; the D．a; the

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In 1948, three American scientists invented transistor, which is small electronic device to control an electric current.

A.
the; a
B.
a; a
C.
the; the
D.
a; the

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In 1948, three American scientists invented ______ transistor, which is ______ small electronic device to control an electric current．

A． the; a B． a; a C． the; the D． a; the

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In 1948, three American scientists invented ____ transistor, which is ____ small electronic device to control an electric current.

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In 1948, three American scientists invented transistor, which is small electronic device to control an electric current.