问题
.Now all of our concentrtion is on _____ it is that the global environment will return to normal.
A:which
B:what
C:where D.when;
D:when;
B:what
C:where D.when;
D:when;
正确答案是：
同类题型
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Atfirst he hated the new job but decided to give himself a few months to see ___it got any better.