问题
单项选择题
The professor recommended in his last lecture that English learners______on the lookout for tenses.
A．will be
B．are
C．should be
D．must be
答案
参考答案：C
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The professor recommended in his last lecture that English learners______on the lookout for tenses.
A．will be
B．are
C．should be
D．must be
参考答案：C