专四
单选题_________填上最佳答案。
A. should
B. when
C. because
D. if
A. should
B. when
C. because
D. if
参考答案：A进入在线模考
四个选项中只有should能够提前，省略if,引导倒装的分句，是与将来事实相反的虚拟语气，正常语序为if his own knowledge should not always…。此外should表示可能性不大的假设，意为“假使，万一”。
【点睛】语法题。考查情态动词的特殊用法。此题如用when，because或if，则not前面缺少助动词或情态动词。
【点睛】语法题。考查情态动词的特殊用法。此题如用when，because或if，则not前面缺少助动词或情态动词。
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