单项选择题

The manager required that all the employees _______at the office before 9:00 in the morning.

A．will arrive
B．arrive
C．arrived
D．have arrived
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单项选择题
The little boy had no choice but to look on _________as his mother was seriously injured in the traffic accident.
A．help
B．helpless
C．helpness
D．helplessly
单项选择题
It makes no difference to me _____ Mr. Smith will come or not.
A．when
B．whether
C．that
D．how
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