A.work hard enough
B.work enough hard
C.hard work enough
D.hard enough work
第3题
Here are some toys. You can ___ one or two for you little son as a gift from me.
A、single out
B、pick out
C、take out
D、work out
第4题
I finally ___ the reference in a dictionary of quotations.
A、track out
B、track down
C、track up
D、trace down
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