单项选择题

（）he retired, Mr. Wang had worked in the factory for 30 years.

A、 Whenever
B、 By the time
C、 The moment
D、 Since

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单项选择题
Li Ming knows a lot about Canada. He must（）a lot of books about that country.

A、 had read
B、 have read
C、 read
D、 have readed
单项选择题
He is（）of the two.

A、 stronger
B、 the stronger
C、 strongest
D、 the strongest
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