单项选择题

Heat energy（）from the sun in a direct way is the most widely used energy today.

A. come
B. to come
C. coming
D. having come

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单项选择题
Spring（）come, people may perhaps look forward to better weather.

A. has
B. had
C. have
D. having
单项选择题
Will you（）the plan to find out whether there is anything unsuitable in it

A. see through
B. look up
C. look through
D. see to
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