★ TOEFL
Researchers have long debated _____________ Saturn’s moon Titan contains hydrocarbon oceans and lakes.
A. over it
B. whether it
C. whether
D. whetherover
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___________ seasonal rainfall, especially in regions near the tropics, is winds that blow in an opposite direction in winter than in summer.
A. Causing
B. That cause
C. To cause
D. What causes
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