单选题
In order to (attain) our objective, it is (essential) that we (will make) the best use of the limited resources (available).
A、
attain
B、
essential
C、
will make
D、
available
【正确答案】
C
【答案解析】
“it is essential that……”中，that从句中要用should do 表示虚拟。
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