单选题
Although we are (concerned with) the problem of energy sources, we (must not) fail (recognizing) the need (for) environmental protection.
A、
concerned with
B、
must not
C、
recognizing
D、
for
【正确答案】
C
【答案解析】
动词fail之后的宾语必须用动词不定式，而不可以用动名词，因此应将recognizing，改为to recognize，意为“我们一定要认识到……”。
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