单项选择题
When we have difficulty ______ obtaining desired objects or reaching desired goals we experience negative emotions such as grief and anger.
A．at
B．in
C．on
D．with
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单项选择题
On the giant plane there are ______ the jet needs.
A．twice engines than
B．twice as engines as
C．as twice many engines as
D．twice as many engines as
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单项选择题
The Olympic Games______ held ______ four years.
A．are; each
B．is; every
C．is; each
D．are; every
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