单项选择题

With a radical new design, the Dust Buster 109 is far more effective than ______ vacuum cleaners.

A．convening
B．convention
C．convenient
D．conventional
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单项选择题
Sales employee Jed Roberts ______ late to the office more than 5 times so far this year.
A．arrives
B．arrived
C．has arrived
D．had arrived
单项选择题
Jennifer Knowles decided to skip the seminar ______ a schedule clash with an important client meeting.
A．owing to
B．without
C．whereas
D．except for
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