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The river water is severely polluted, mostly________ the dumping of raw sewage.

A. due to

B. lead to

C. because

D. so

Have you ever … the beautiful desert scenery?

1. see
2. seen

Grammar › View

What is the purpose of the closing sentence in a paragraph?

A. To wrap up the paragraph

B. To introduce a new idea

C. To provide an example

D. To give more details

Most teacher _________ of whiteboard technology up to now.

A. hear

B. have heard

C. had heard

D. will hear