单项选择题

There are some health problems that, when______ in time, can become bigger ones later on.

A．not treated
B．not being treated
C．not to be treated
D．not have been treated
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单项选择题
—Oh no! We’re too late. The train ______. —That’ s Ok. We’ 11 catch the next train to London.
A．was leaving
B．had left
C．has left
D．has been leaving
单项选择题
—I don’t understand why you didn’t go to the lecture yesterday afternoon. —I’ m sorry, but I ______ my homework.
A．had done
B．was doing
C．would do
D．am doing
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