单项选择题

He _______ so much work that he couldn’’t really do it efficiently.

A．put on
B．turned on
C．brought on
D．took on

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单项选择题

A．sinceB．soC．whileD．for

A．since
B．so
C．while
D．for

单项选择题

You ______ him so closely; you should have kept your distance.

A．shouldn’’t follow
B．mustn’’t follow
C．couldn’’t have been following
D．shouldn’’t have been following

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