单项选择题

If you (happen) to (come across) Jack, please tell him (to come) and see me when he (will be) free.

A．happen
B．come across
C．to come
D．will be
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单项选择题
(The simplest) kind of plant, (alike) the simplest kind of animal, (consists of) (only one) cell.
A．The simplest
B．alike
C．consists of
D．only one
单项选择题
The doctor (told) him that he (should take) this medicine (one) pill at (one) time.
A．told
B．should take
C．one
D．one
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