21.   All the archaeological discoveries of our country occurred in the present century.

a. + century >>共 235
half 31.95%
new 15.72%
past 9.73%
double 2.24%
last 2.15%
coming 1.78%
maiden 1.69%
old 1.46%
american 1.33%
second 1.19%
present 0.96%
present + n. >>共 1491
system 3.56%
situation 2.99%
government 2.59%
form 2.28%
day 2.15%
time 2.12%
crisis 1.56%
level 1.47%
study 1.28%
state 1.26%
century 0.33%
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