I wonder ____ we can solve this hard problem.
A．what elseB．how elseC．thatD．a(chǎn)s if
.B
考連詞how else的用法。how else="in" what other way。如選A項(xiàng)，句子應(yīng)當(dāng)改為:“I wonder what else we can do to solve this problem”而用C、D項(xiàng)不合句意。
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