---How’s your tour around the North Lake? Is it beautiful?
---It ________ be, but it is now heavily polluted.
A．willB．wouldC．shouldD．must
C
should意為“應該”。根據(jù)所提供的情景“but it is now heavily polluted”可判斷出它應該是美麗的。will作情態(tài)動詞意為“愿意”；would意為“愿意”；must意為“必須”。
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