单项选择题

Only after a baby seal is pushed into the sea by its mother ______ how to swim.

A．will it learn
B．it will learn
C．has it learned
D．it has learned
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单项选择题
Jane's parents recommended that she ______ a foreign language in her freshman year instead of waiting until the following year.
A．would take
B．takes
C．take
D．was to take
单项选择题
Revenues from oil are the biggest single ______ in the country's income.
A．company
B．companion
C．component
D．compound
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