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【单选题】If you have difficulty your bills, tell your utility company (公用事业公司)as soon as possible.
A.
paid
B.
pay
C.
to pay
D.
paying
【单选题】Those who use solar energy help us save our precious fnel．As you know, our supplies of oil and gas are very limited．There is just not enough on hand to meet all our future energy needs．And when Mother...
A.
Energy from the sun.
B.
Natural gas.
C.
How oil is made.
D.
Saving energy.
相关题目：
【单选题】If you have difficulty your bills, tell your utility company (公用事业公司)as soon as possible.
A.
paid
B.
pay
C.
to pay
D.
paying
【单选题】Those who use solar energy help us save our precious fnel．As you know, our supplies of oil and gas are very limited．There is just not enough on hand to meet all our future energy needs．And when Mother...
A.
Energy from the sun.
B.
Natural gas.
C.
How oil is made.
D.
Saving energy.
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