单项选择题

That troubles me is that I can’t learn all these English idioms by heart.

A. That
B. that
C. all these
D. by heart
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单项选择题
We see lightning (before we) hear the thunder (because) sound travels (more slowly) than (light is).()

A. before we
B. because
C. more slowly
D. light is
单项选择题
It is vital that enough money ______ to fund the project.
A. be collected

B. must be collected
C. is collected

D. can be collected
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