We still know little about the Moon _____ men have landed on it.
句意：虽然人类已经登上月球，但我们对月球仍然知之甚少。
考查连词。if如果；since自……以来；although虽然；because因为；根据句意理解及句中的still可知，这里表达的是“虽然”，故选C。
We still know little about the Moon _____ men have landed on it.
The movie Nezha is_______ educational ____ I want to see it again.
You can surf the Internet ______ you want to know more about the 2020 World Middle School Games.
—How time flies! The middle school life is coming to an end.
—Yes. We have to say goodbye, ________ our friendship will last forever.
Mike and Jim's room is tidy, ______ their sister's not.
Our English teacher is nice and patient she is very strict with us.
Even if we learn something well, we will forget it ______ we use it.
Wash your hands before meals, ______ you may get ill.
—Who went to the graduation party last night, Mary?
—Almost everyone did. ______ lots of students _____ Ms. Wang appeared at the party.
Restaurants must stop offering free plastic bags in Beijing _______ customers ask for them.
