单项选择题

Without proper lessons, you could __________ a lot of bad habits when playing the piano.

A．keep up
B．pick up
C．draw up
D．catch up
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单项选择题
The computer can be paid for in ten monthly __________ of 100 dollars.
A．pay
B．pays
C．payment
D．payments
单项选择题
Some plants are very __________ to light; they prefer the shade.
A．sensible
B．flexible
C．objective
D．sensitive
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