单项选择题

__________ the population is too large, we have to take measures to control the birth rate.

A．Although
B．Since
C．If
D．Until
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单项选择题
Wordsworth was one of the greatest poets __________ lived in the 19th century.
A．which
B．who
C．those
D．that
单项选择题
He said, I __________ a lot of new poems by the end of last year.
A．had already learnt
B．have already learnt
C．would have already learnt
D．already learnt
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