He promised to help me and then_________.
A．back outB．backed outC．backed ofD．backed on
B
詞義辨析。back out不遵守諾言；backed of在……后邊；backed on背靠。句意：他許諾了幫助我，然后又反悔了。根據(jù)句子謂語promised，所以用一般過去時(shí)，選B。
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