【題目】Human population growth will be probably the most serious problem if it _____(not control ) properly.

【答案】isn't controlled

【解析】

句意：人口的增長如果不適當?shù)目刂�，就可能是最嚴重的問題。

根據(jù)if引導的條件狀語從句，遵循主將從現(xiàn)的規(guī)則，故從句用一般現(xiàn)在時，結(jié)合not control用否定式，主語it替代Human population 是動詞control"控制"的承受者，構(gòu)成被動關(guān)系，故用一般現(xiàn)在時的被動語態(tài)am/is/are+過去分詞，主語it三單，故is，加上not縮寫成isn't，control的過去分詞是controlled，故答案為isn't controlled。

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