单项选择题

They are teachers and don’t realize ______ to start and run a company.

A. what it takes


B. what takes it
C. what they take


D. what takes them
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单项选择题
You see the lightning ______ it happens, but you hear the thunder later.
A. the instant


B. for an instant
C. on the instant


D. in an instant
单项选择题
Busy ______ he is, he can fulfill the task ahead of schedule.
A. because
B. as

C. no matter how D. although
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