How to control housing price is said to       a great challenge facing the government over the past few years.
A．becomeB．becomingC．have becomeD．be becoming
C
本題考查非謂語動詞。題中考查不定式的時態(tài)，根據(jù)語境：已經(jīng)成為一個巨大的挑戰(zhàn)。故用不定式的完成時。選C。
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