题目内容

植物必需营养元素的种类及其判定条件有哪些？

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根外营养的特点？

When ________ to the party, he was very happy and accepted it.

A. inviting
B. to be invited
C. invited
D. having invited

Here is too noisy for us ________.

A. to talk
B. talk
C. talking
D. talked

While ________, he was doing his homework.

A. listening to music
B. to listen to music
C. listen to music
D. having listened to music