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Why not ______ your teacher for help when you can’t    finish ______ it by yourself?
A．a(chǎn)sk; writeB．to ask; writing
C．a(chǎn)sk; writingD．a(chǎn)sking; write
C
考查固定搭配。Why not do sth.為什么不做某事；finish doing sth.做完某事。所以選C。
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